Csi reporting method, csi receiving method, and apparatus

ABSTRACT

The present invention relates to the field of communications technologies, and in particular, to a CSI reporting method, a CSI receiving method, and an apparatus, to resolve a technical problem that PUCCH resource overheads are relatively large during CSI reporting. In embodiments of the present invention, at least two PUCCH resources are configured for each downlink carrier group. CSI that needs to be reported in one uplink subframe may be obtained, and a format of a corresponding PUCCH resource is determined according to the to-be-reported CSI. For example, the determined format is referred to as a first format. Then, all of the to-be-reported CSI is reported after being added to a first first-format PUCCH resource.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of International Application No.PCT/CN2015/074700, filed on Mar. 20, 2015, the disclosure of which ishereby incorporated by reference in its entirety.

TECHNICAL FIELD

The present invention relates to the field of communicationstechnologies, and in particular, to a CSI reporting method, a CSIreceiving method, and an apparatus.

BACKGROUND

In addition to supporting implicit feedbacks of channel statusinformation such as an RI (rank indication), a CQI (channel qualityindicator), and a PMI (precoding matrix indication) of an LTE system, anLTE-A (Long Term Evolution-Advanced) system may further support a directfeedback of channel status information such as a channel matrix feedbackor a channel covariance matrix feedback, which are collectively referredto as a CSI (channel state information) feedback.

In the existing LTE R12 (LTE release 12), only a PUCCH resource in aPUCCH (physical uplink control channel) format 2 is used for CSItransmission. A maximum quantity of bits that are supported by theformat is 11. In addition, a 32-CA (carrier aggregation) technology isintroduced to an LTE R13 (LTE release 13) system. As stipulated in theLTE R10 (LTE release 10) standard, a parameter corresponding to CSI ofeach downlink carrier is independently configured, and parameters suchas a PUCCH resource used to transmit CSI of each downlink carrier and areport period are also independently configured. In a 32-carrieraggregation scenario, CSI corresponding to each carrier needs to bereported by using a separate PUCCH resource. Therefore, overheads ofPUCCH resources occupied for CSI reporting are relatively large. Inother words, a throughput of an uplink system is reduced.

SUMMARY

Embodiments of the present invention provide a CSI reporting method, aCSI receiving method, and an apparatus, to resolve a technical problemthat PUCCH resource overheads are relatively large during CSI reporting.

A first aspect of the present invention provides a CSI reporting method,including:

obtaining CSI that is to be reported in an uplink subframe, where theto-be-reported CSI is corresponding to one or more downlink carriergroups, at least two PUCCH resources are configured for one downlinkcarrier group, and the at least two PUCCH resources have differentformats;

determining, according to the to-be-reported CSI, that a format of aPUCCH resource corresponding to the to-be-reported CSI is a firstformat; and

adding the to-be-reported CSI to a first first-format PUCCH resource,and reporting the to-be-reported CSI.

With reference to the first aspect, in a first possible implementationof the first aspect,

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format3; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 3 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2, a PUCCH resource corresponding to a PUCCH format 3,and a PUCCH resource corresponding to a PUCCH format 4.

With reference to the first possible implementation of the first aspect,in a second possible implementation of the first aspect, thedetermining, according to the to-be-reported CSI, that a format of aPUCCH resource corresponding to the to-be-reported CSI is a first formatincludes:

determining, according to a quantity of carriers corresponding to theto-be-reported CSI, that the format of the PUCCH resource correspondingto the to-be-reported CSI is the first format; or

determining, according to a quantity of bits of the to-be-reported CSI,that the format of the PUCCH resource corresponding to theto-be-reported CSI is the first format.

With reference to the second possible implementation of the firstaspect, in a third possible implementation of the first aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 2 and the PUCCH resource corresponding to the PUCCHformat 3; and

the determining, according to a quantity of carriers corresponding tothe to-be-reported CSI, that the format of the PUCCH resourcecorresponding to the to-be-reported CSI is the first format includes:

if the quantity of carriers is greater than a first quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 3; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 2; or

the determining, according to a quantity of bits of the to-be-reportedCSI, that the format of the PUCCH resource corresponding to theto-be-reported CSI is the first format includes:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 3; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 2.

With reference to the second possible implementation of the firstaspect, in a fourth possible implementation of the first aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 2 and the PUCCH resource corresponding to the PUCCHformat 4; and

the determining, according to a quantity of carriers corresponding tothe to-be-reported CSI, that the format of the PUCCH resourcecorresponding to the to-be-reported CSI is the first format includes:

if the quantity of carriers is greater than a first quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 2; or

the determining, according to a quantity of bits of the to-be-reportedCSI, that the format of the PUCCH resource corresponding to theto-be-reported CSI is the first format includes:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 2.

With reference to the second possible implementation of the firstaspect, in a fifth possible implementation of the first aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 3 and the PUCCH resource corresponding to the PUCCHformat 4; and

the determining, according to a quantity of carriers corresponding tothe to-be-reported CSI, that the format of the PUCCH resourcecorresponding to the to-be-reported CSI is the first format includes:

if the quantity of carriers is greater than a second quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 3; or

the determining, according to a quantity of bits of the to-be-reportedCSI, that the format of the PUCCH resource corresponding to theto-be-reported CSI is the first format includes:

if the quantity of bits is greater than a fourth quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 3.

With reference to the second possible implementation of the firstaspect, in a sixth possible implementation of the first aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 2, the PUCCH resource corresponding to the PUCCH format3, and the PUCCH resource corresponding to the PUCCH format 4; and

the determining, according to a quantity of carriers corresponding tothe to-be-reported CSI, that the format of the PUCCH resourcecorresponding to the to-be-reported CSI is the first format includes:

if the quantity of carriers is less than or equal to a first quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 2; or

if the quantity of carriers is greater than the first quantity and isless than or equal to a second quantity, determining that the format ofthe PUCCH resource corresponding to the to-be-reported CSI is the PUCCHformat 3; or

if the quantity of carriers is greater than the second quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; or

the determining, according to a quantity of bits of the to-be-reportedCSI, that the format of the PUCCH resource corresponding to theto-be-reported CSI is the first format includes:

if the quantity of bits is less than or equal to a third quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 2; or

if the quantity of bits is greater than the third quantity and is lessthan or equal to a fourth quantity, determining that the format of thePUCCH resource corresponding to the to-be-reported CSI is the PUCCHformat 3; or

if the quantity of bits is greater than the fourth quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4.

With reference to any one of the first aspect or the first possibleimplementation to the sixth possible implementation of the first aspect,in a seventh possible implementation of the first aspect, the adding theto-be-reported CSI to a first first-format PUCCH resource, and reportingthe to-be-reported CSI includes:

determining the first PUCCH resource from at least one first-formatPUCCH resource corresponding to each of the one or more downlink carriergroups to which the to-be-reported CSI belongs; and

adding the to-be-reported CSI to the first PUCCH resource, and reportingthe to-be-reported CSI.

With reference to the seventh possible implementation of the firstaspect, in an eighth possible implementation of the first aspect, thedetermining the first PUCCH resource from at least one first-formatPUCCH resource corresponding to each of the one or more downlink carriergroups to which the to-be-reported CSI belongs includes:

determining the first PUCCH resource from the at least one PUCCHresource according to received information sent by a network device; or

determining, from the at least one PUCCH resource, a smallest-numberedPUCCH resource as the first PUCCH resource; or

determining, from the at least one PUCCH resource, a largest-numberedPUCCH resource as the first PUCCH resource; or

determining, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a smallest-numberedcarrier as the first PUCCH resource; or

determining, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a largest-numberedcarrier as the first PUCCH resource.

A second aspect of the present invention provides a CSI receivingmethod, including:

determining CSI that is to be reported by user equipment in an uplinksubframe, where the CSI is corresponding to one or more downlink carriergroups, at least two PUCCH resources are configured for one downlinkcarrier group, and the at least two PUCCH resources have differentformats;

determining, according to the CSI, that a format of the PUCCH resourcecorresponding to the CSI is a first format; and

receiving the CSI carried on a first first-format PUCCH resource.

With reference to the second aspect, in a first possible implementationof the second aspect,

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format3; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 3 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2, a PUCCH resource corresponding to a PUCCH format 3,and a PUCCH resource corresponding to a PUCCH format 4.

With reference to the first possible implementation of the secondaspect, in a second possible implementation of the second aspect, thedetermining, according to the CSI, that a format of a PUCCH resourcecorresponding to the CSI is a first format includes:

determining, according to a quantity of carriers corresponding to theCSI, that the format of the PUCCH resource corresponding to the CSI isthe first format; or

determining, according to a quantity of bits of the CSI, that the formatof the PUCCH resource corresponding to the CSI is the first format.

With reference to the second possible implementation of the secondaspect, in a third possible implementation of the second aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 2 and the PUCCH resource corresponding to the PUCCHformat 3; and

the determining, according to a quantity of carriers corresponding tothe CSI, that the format of the PUCCH resource corresponding to the CSIis the first format includes:

if the quantity of carriers is greater than a first quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 3; otherwise, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 2; or

the determining, according to a quantity of bits of the CSI, that theformat of the PUCCH resource corresponding to the CSI is the firstformat includes:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 3; otherwise, determining that the format of the PUCCHresource corresponding to the CSI is the PUCCH format 2.

With reference to the second possible implementation of the secondaspect, in a fourth possible implementation of the second aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 2 and the PUCCH resource corresponding to the PUCCHformat 4; and

the determining, according to a quantity of carriers corresponding tothe CSI, that the format of the PUCCH resource corresponding to the CSIis the first format includes:

if the quantity of carriers is greater than a first quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 4; otherwise, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 2; or

the determining, according to a quantity of bits of the CSI, that theformat of the PUCCH resource corresponding to the CSI is the firstformat includes:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 4; otherwise, determining that the format of the PUCCHresource corresponding to the CSI is the PUCCH format 2.

With reference to the second possible implementation of the secondaspect, in a fifth possible implementation of the second aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 3 and the PUCCH resource corresponding to the PUCCHformat 4; and

the determining, according to a quantity of carriers corresponding tothe CSI, that the format of the PUCCH resource corresponding to the CSIis the first format includes:

if the quantity of carriers is greater than a second quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 4; otherwise, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 3; or

the determining, according to a quantity of bits of the CSI, that theformat of the PUCCH resource corresponding to the CSI is the firstformat includes:

if the quantity of bits is greater than a fourth quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 4; otherwise, determining that the format of the PUCCHresource corresponding to the CSI is the PUCCH format 3.

With reference to the second possible implementation of the secondaspect, in a sixth possible implementation of the second aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 2, the PUCCH resource corresponding to the PUCCH format3, and the PUCCH resource corresponding to the PUCCH format 4; and

the determining, according to a quantity of carriers corresponding tothe CSI, that the format of the PUCCH resource corresponding to the CSIis the first format includes:

if the quantity of carriers is less than or equal to a first quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 2; or

if the quantity of carriers is greater than the first quantity and isless than or equal to a second quantity, determining that the format ofthe PUCCH resource corresponding to the CSI is the PUCCH format 3; or

if the quantity of carriers is greater than the second quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 4; or

the determining, according to a quantity of bits of the CSI, that theformat of the PUCCH resource corresponding to the CSI is the firstformat includes:

if the quantity of bits is less than or equal to a third quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 2; or

if the quantity of bits is greater than the third quantity and is lessthan or equal to a fourth quantity, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 3; or

if the quantity of bits is greater than the fourth quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 4.

With reference to any one of the second aspect or the first possibleimplementation to the sixth possible implementation of the secondaspect, in a seventh possible implementation of the second aspect,before the receiving the CSI carried on a first first-format PUCCHresource, the method further includes:

determining the first PUCCH resource from at least one first-formatPUCCH resource corresponding to each of the one or more downlink carriergroups to which the CSI belongs; and

determining to receive the CSI by using the first PUCCH resource.

With reference to the seventh possible implementation of the secondaspect, in an eighth possible implementation of the second aspect, thedetermining the first PUCCH resource from at least one first-formatPUCCH resource corresponding to each of the one or more downlink carriergroups to which the CSI belongs includes:

determining the first PUCCH resource from the at least one PUCCHresource according to received information sent by a network device; or

determining, from the at least one PUCCH resource, a smallest-numberedPUCCH resource as the first PUCCH resource; or

determining, from the at least one PUCCH resource, a largest-numberedPUCCH resource as the first PUCCH resource; or

determining, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a smallest-numberedcarrier as the first PUCCH resource; or

determining, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a largest-numberedcarrier as the first PUCCH resource.

A third aspect of the present invention provides user equipment,including:

an obtaining module, configured to obtain CSI that is to be reported inan uplink subframe, where the to-be-reported CSI is corresponding to oneor more downlink carrier groups, at least two PUCCH resources areconfigured for one downlink carrier group, and the at least two PUCCHresources have different formats;

a determining module, configured to determine, according to theto-be-reported CSI, that a format of a PUCCH resource corresponding tothe to-be-reported CSI is a first format; and

a sending module, configured to add the to-be-reported CSI to a firstfirst-format PUCCH resource, and report the to-be-reported CSI.

With reference to the third aspect, in a first possible implementationof the third aspect,

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format3; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 3 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2, a PUCCH resource corresponding to a PUCCH format 3,and a PUCCH resource corresponding to a PUCCH format 4.

With reference to the first possible implementation of the third aspect,in a second possible implementation of the third aspect, the determiningmodule is specifically configured to:

determine, according to a quantity of carriers corresponding to theto-be-reported CSI, that the format of the PUCCH resource correspondingto the to-be-reported CSI is the first format; or

determine, according to a quantity of bits of the to-be-reported CSI,that the format of the PUCCH resource corresponding to theto-be-reported CSI is the first format.

With reference to the second possible implementation of the thirdaspect, in a third possible implementation of the third aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 2 and the PUCCH resource corresponding to the PUCCHformat 3; and

that the determining module is specifically configured to determine,according to a quantity of carriers corresponding to the to-be-reportedCSI, that the format of the PUCCH resource corresponding to theto-be-reported CSI is the first format is specifically:

if the quantity of carriers is greater than a first quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 3; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 2; or

that the determining module is specifically configured to determine,according to a quantity of bits of the to-be-reported CSI, that theformat of the PUCCH resource corresponding to the to-be-reported CSI isthe first format is specifically:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 3; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 2.

With reference to the second possible implementation of the thirdaspect, in a fourth possible implementation of the third aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 2 and the PUCCH resource corresponding to the PUCCHformat 4; and

that the determining module is specifically configured to determine,according to a quantity of carriers corresponding to the to-be-reportedCSI, that the format of the PUCCH resource corresponding to theto-be-reported CSI is the first format is specifically:

if the quantity of carriers is greater than a first quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 2; or

that the determining module is specifically configured to determine,according to a quantity of bits of the to-be-reported CSI, that theformat of the PUCCH resource corresponding to the to-be-reported CSI isthe first format is specifically:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 2.

With reference to the second possible implementation of the thirdaspect, in a fifth possible implementation of the third aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 3 and the PUCCH resource corresponding to the PUCCHformat 4; and

that the determining module is specifically configured to determine,according to a quantity of carriers corresponding to the to-be-reportedCSI, that the format of the PUCCH resource corresponding to theto-be-reported CSI is the first format is specifically:

if the quantity of carriers is greater than a second quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 3; or

that the determining module is specifically configured to determine,according to a quantity of bits of the to-be-reported CSI, that theformat of the PUCCH resource corresponding to the to-be-reported CSI isthe first format is specifically:

if the quantity of bits is greater than a fourth quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 3.

With reference to the second possible implementation of the thirdaspect, in a sixth possible implementation of the third aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 2, the PUCCH resource corresponding to the PUCCH format3, and the PUCCH resource corresponding to the PUCCH format 4; and

that the determining module is specifically configured to determine,according to a quantity of carriers corresponding to the to-be-reportedCSI, that the format of the PUCCH resource corresponding to theto-be-reported CSI is the first format is specifically:

if the quantity of carriers is less than or equal to a first quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 2; or

if the quantity of carriers is greater than the first quantity and isless than or equal to a second quantity, determining that the format ofthe PUCCH resource corresponding to the to-be-reported CSI is the PUCCHformat 3; or

if the quantity of carriers is greater than the second quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; or

that the determining module is specifically configured to determine,according to a quantity of bits of the to-be-reported CSI, that theformat of the PUCCH resource corresponding to the to-be-reported CSI isthe first format is specifically:

if the quantity of bits is less than or equal to a third quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 2; or

if the quantity of bits is greater than the third quantity and is lessthan or equal to a fourth quantity, determining that the format of thePUCCH resource corresponding to the to-be-reported CSI is the PUCCHformat 3; or

if the quantity of bits is greater than the fourth quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4.

With reference to any one of the third aspect or the first possibleimplementation to the sixth possible implementation of the third aspect,in a seventh possible implementation of the third aspect, the sendingmodule is specifically configured to:

determine the first PUCCH resource from at least one first-format PUCCHresource corresponding to each of the one or more downlink carriergroups to which the to-be-reported CSI belongs; and

add the to-be-reported CSI to the first PUCCH resource, and report theto-be-reported CSI.

With reference to the seventh possible implementation of the thirdaspect, in an eighth possible implementation of the third aspect, thatthe sending module is specifically configured to determine the firstPUCCH resource from at least one first-format PUCCH resourcecorresponding to each of the one or more downlink carrier groups towhich the to-be-reported CSI belongs is specifically:

determining the first PUCCH resource from the at least one PUCCHresource according to received information sent by a network device; or

determining, from the at least one PUCCH resource, a smallest-numberedPUCCH resource as the first PUCCH resource; or

determining, from the at least one PUCCH resource, a largest-numberedPUCCH resource as the first PUCCH resource; or

determining, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a smallest-numberedcarrier as the first PUCCH resource; or

determining, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a largest-numberedcarrier as the first PUCCH resource.

A fourth aspect of the present invention provides a network device,including:

a first determining module, configured to determine channel stateinformation CSI that is to be reported by user equipment in an uplinksubframe, where the CSI is corresponding to one or more downlink carriergroups, at least two physical uplink control channel PUCCH resources areconfigured for one downlink carrier group, and the at least two PUCCHresources have different formats;

a second determining module, configured to determine, according to theCSI, that a format of a PUCCH resource corresponding to the CSI is afirst format; and

a receiving module, configured to receive the CSI carried on a firstfirst-format PUCCH resource.

With reference to the fourth aspect, in a first possible implementationof the fourth aspect,

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format3; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 3 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2, a PUCCH resource corresponding to a PUCCH format 3,and a PUCCH resource corresponding to a PUCCH format 4.

With reference to the first possible implementation of the fourthaspect, in a second possible implementation of the fourth aspect, thesecond determining module is specifically configured to:

determine, according to a quantity of carriers corresponding to the CSI,that the format of the PUCCH resource corresponding to the CSI is thefirst format; or

determine, according to a quantity of bits of the CSI, that the formatof the PUCCH resource corresponding to the CSI is the first format.

With reference to the second possible implementation of the fourthaspect, in a third possible implementation of the fourth aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 2 and the PUCCH resource corresponding to the PUCCHformat 3; and

that the second determining module is specifically configured todetermine, according to a quantity of carriers corresponding to the CSI,that the format of the PUCCH resource corresponding to the CSI is thefirst format is specifically:

if the quantity of carriers is greater than a first quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 3; otherwise, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 2; or

that the second determining module is specifically configured todetermine, according to a quantity of bits of the CSI, that the formatof the PUCCH resource corresponding to the CSI is the first format isspecifically:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 3; otherwise, determining that the format of the PUCCHresource corresponding to the CSI is the PUCCH format 2.

With reference to the second possible implementation of the fourthaspect, in a fourth possible implementation of the fourth aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 2 and the PUCCH resource corresponding to the PUCCHformat 4; and

that the second determining module is specifically configured todetermine, according to a quantity of carriers corresponding to the CSI,that the format of the PUCCH resource corresponding to the CSI is thefirst format is specifically:

if the quantity of carriers is greater than a first quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 4; otherwise, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 2; or

that the second determining module is specifically configured todetermine, according to a quantity of bits of the CSI, that the formatof the PUCCH resource corresponding to the CSI is the first format isspecifically:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 4; otherwise, determining that the format of the PUCCHresource corresponding to the CSI is the PUCCH format 2.

With reference to the second possible implementation of the fourthaspect, in a fifth possible implementation of the fourth aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 3 and the PUCCH resource corresponding to the PUCCHformat 4; and

that the second determining module is specifically configured todetermine, according to a quantity of carriers corresponding to the CSI,that the format of the PUCCH resource corresponding to the CSI is thefirst format is specifically:

if the quantity of carriers is greater than a second quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 4; otherwise, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 3; or

that the second determining module is specifically configured todetermine, according to a quantity of bits of the CSI, that the formatof the PUCCH resource corresponding to the CSI is the first format isspecifically:

if the quantity of bits is greater than a fourth quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 4; otherwise, determining that the format of the PUCCHresource corresponding to the CSI is the PUCCH format 3.

With reference to the second possible implementation of the fourthaspect, in a sixth possible implementation of the fourth aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 2, the PUCCH resource corresponding to the PUCCH format3, and the PUCCH resource corresponding to the PUCCH format 4; and

that the second determining module is specifically configured todetermine, according to a quantity of carriers corresponding to the CSI,that the format of the PUCCH resource corresponding to the CSI is thefirst format is specifically:

if the quantity of carriers is less than or equal to a first quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 2; or

if the quantity of carriers is greater than the first quantity and isless than or equal to a second quantity, determining that the format ofthe PUCCH resource corresponding to the CSI is the PUCCH format 3; or

if the quantity of carriers is greater than the second quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 4; or

that the second determining module is specifically configured todetermine, according to a quantity of bits of the CSI, that the formatof the PUCCH resource corresponding to the CSI is the first format isspecifically:

if the quantity of bits is less than or equal to a third quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 2; or

if the quantity of bits is greater than the third quantity and is lessthan or equal to a fourth quantity, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 3; or

if the quantity of bits is greater than the fourth quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 4.

With reference to any one of the fourth aspect or the first possibleimplementation to the sixth possible implementation of the fourthaspect, in a seventh possible implementation of the fourth aspect, thenetwork device further includes a third determining module and a fourthdetermining module, where

the third determining module is configured to: before the receivingmodule receives the CSI carried on a first first-format PUCCH resource,determine the first PUCCH resource from at least one first-format PUCCHresource corresponding to each of the one or more downlink carriergroups to which the CSI belongs; and

the fourth determining module is configured to determine to receive theCSI by using the first PUCCH resource.

With reference to the seventh possible implementation of the fourthaspect, in an eighth possible implementation of the fourth aspect, thethird determining module is specifically configured to:

determine the first PUCCH resource from the at least one PUCCH resourceaccording to received information sent by the network device; or

determine, from the at least one PUCCH resource, a smallest-numberedPUCCH resource as the first PUCCH resource; or

determine, from the at least one PUCCH resource, a largest-numberedPUCCH resource as the first PUCCH resource; or

determine, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a smallest-numberedcarrier as the first PUCCH resource; or

determine, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a largest-numberedcarrier as the first PUCCH resource.

A fifth aspect of the present invention provides user equipment,including a memory, a processor, and a transceiver that are connected toa same bus, where

the memory is configured to store an instruction; and

the processor is configured to: execute the instruction, to obtain CSIthat is to be reported in an uplink subframe, where the to-be-reportedCSI is corresponding to one or more downlink carrier groups, at leasttwo PUCCH resources are configured for one downlink carrier group, andthe at least two PUCCH resources have different formats; determine,according to the to-be-reported CSI, that a format of a PUCCH resourcecorresponding to the to-be-reported CSI is a first format; and add theto-be-reported CSI to a first first-format PUCCH resource, and reportthe to-be-reported CSI by using the transceiver.

With reference to the fifth aspect, in a first possible implementationof the fifth aspect,

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format3; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 3 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2, a PUCCH resource corresponding to a PUCCH format 3,and a PUCCH resource corresponding to a PUCCH format 4.

With reference to the first possible implementation of the fifth aspect,in a second possible implementation of the fifth aspect, that theprocessor is configured to determine, according to the to-be-reportedCSI, that a format of a PUCCH resource corresponding to theto-be-reported CSI is a first format is specifically:

determining, according to a quantity of carriers corresponding to theto-be-reported CSI, that the format of the PUCCH resource correspondingto the to-be-reported CSI is the first format; or

determining, according to a quantity of bits of the to-be-reported CSI,that the format of the PUCCH resource corresponding to theto-be-reported CSI is the first format.

With reference to the second possible implementation of the fifthaspect, in a third possible implementation of the fifth aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 2 and the PUCCH resource corresponding to the PUCCHformat 3; and

that the processor is specifically configured to determine, according toa quantity of carriers corresponding to the to-be-reported CSI, that theformat of the PUCCH resource corresponding to the to-be-reported CSI isthe first format is specifically:

if the quantity of carriers is greater than a first quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 3; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 2; or

that the processor is specifically configured to determine, according toa quantity of bits of the to-be-reported CSI, that the format of thePUCCH resource corresponding to the to-be-reported CSI is the firstformat is specifically:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 3; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 2.

With reference to the second possible implementation of the fifthaspect, in a fourth possible implementation of the fifth aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 2 and the PUCCH resource corresponding to the PUCCHformat 4; and

that the processor is specifically configured to determine, according toa quantity of carriers corresponding to the to-be-reported CSI, that theformat of the PUCCH resource corresponding to the to-be-reported CSI isthe first format is specifically:

if the quantity of carriers is greater than a first quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 2; or

that the processor is specifically configured to determine, according toa quantity of bits of the to-be-reported CSI, that the format of thePUCCH resource corresponding to the to-be-reported CSI is the firstformat is specifically:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4;

otherwise, determining that the format of the PUCCH resourcecorresponding to the to-be-reported CSI is the PUCCH format 2.

With reference to the second possible implementation of the fifthaspect, in a fifth possible implementation of the fifth aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 3 and the PUCCH resource corresponding to the PUCCHformat 4; and

that the processor is specifically configured to determine, according toa quantity of carriers corresponding to the to-be-reported CSI, that theformat of the PUCCH resource corresponding to the to-be-reported CSI isthe first format is specifically:

if the quantity of carriers is greater than a second quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 3; or

that the processor is specifically configured to determine, according toa quantity of bits of the to-be-reported CSI, that the format of thePUCCH resource corresponding to the to-be-reported CSI is the firstformat is specifically:

if the quantity of bits is greater than a fourth quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 3.

With reference to the second possible implementation of the fifthaspect, in a sixth possible implementation of the fifth aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 2, the PUCCH resource corresponding to the PUCCH format3, and the PUCCH resource corresponding to the PUCCH format 4; and

that the processor is specifically configured to determine, according toa quantity of carriers corresponding to the to-be-reported CSI, that theformat of the PUCCH resource corresponding to the to-be-reported CSI isthe first format is specifically:

if the quantity of carriers is less than or equal to a first quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 2; or

if the quantity of carriers is greater than the first quantity and isless than or equal to a second quantity, determining that the format ofthe PUCCH resource corresponding to the to-be-reported CSI is the PUCCHformat 3; or

if the quantity of carriers is greater than the second quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; or

that the processor is specifically configured to determine, according toa quantity of bits of the to-be-reported CSI, that the format of thePUCCH resource corresponding to the to-be-reported CSI is the firstformat is specifically:

if the quantity of bits is less than or equal to a third quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 2; or

if the quantity of bits is greater than the third quantity and is lessthan or equal to a fourth quantity, determining that the format of thePUCCH resource corresponding to the to-be-reported CSI is the PUCCHformat 3; or

if the quantity of bits is greater than the fourth quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4.

With reference to any one of the fifth aspect or the first possibleimplementation to the sixth possible implementation of the fifth aspect,in a seventh possible implementation of the fifth aspect, that theprocessor is configured to add the to-be-reported CSI to a firstfirst-format PUCCH resource, and report the to-be-reported CSI by usingthe transceiver is specifically:

determining the first PUCCH resource from at least one first-formatPUCCH resource corresponding to each of the one or more downlink carriergroups to which the to-be-reported CSI belongs; and

adding the to-be-reported CSI to the first PUCCH resource, and reportingthe to-be-reported CSI by using the transceiver.

With reference to the seventh possible implementation of the fifthaspect, in an eighth possible implementation of the fifth aspect, thatthe processor is specifically configured to determine the first PUCCHresource from at least one first-format PUCCH resource corresponding toeach of the one or more downlink carrier groups to which theto-be-reported CSI belongs is specifically:

determining the first PUCCH resource from the at least one PUCCHresource according to information that is sent by a network device andthat is received by the transceiver; or

determining, from the at least one PUCCH resource, a smallest-numberedPUCCH resource as the first PUCCH resource; or

determining, from the at least one PUCCH resource, a largest-numberedPUCCH resource as the first PUCCH resource; or

determining, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a smallest-numberedcarrier as the first PUCCH resource; or

determining, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a largest-numberedcarrier as the first PUCCH resource.

A sixth aspect of the present invention provides a network device,including a memory, a processor, and a receiver that are connected to asame bus, where

the memory is configured to store an instruction;

the processor is configured to: execute the instruction, to determineCSI that is to be reported by user equipment in an uplink subframe,where the CSI is corresponding to one or more downlink carrier groups,at least two PUCCH resources are configured for one downlink carriergroup, and the at least two PUCCH resources have different formats; anddetermine, according to the CSI, that a format of a PUCCH resourcecorresponding to the CSI is a first format; and

the receiver is configured to receive the CSI carried on a firstfirst-format PUCCH resource.

With reference to the sixth aspect, in a first possible implementationof the sixth aspect,

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format3; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 3 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2, a PUCCH resource corresponding to a PUCCH format 3,and a PUCCH resource corresponding to a PUCCH format 4.

With reference to the first possible implementation of the sixth aspect,in a second possible implementation of the sixth aspect, that theprocessor is configured to determine, according to the CSI, that aformat of a PUCCH resource corresponding to the CSI is a first format isspecifically:

determining, according to a quantity of carriers corresponding to theCSI, that the format of the PUCCH resource corresponding to the CSI isthe first format; or

determining, according to a quantity of bits of the CSI, that the formatof the PUCCH resource corresponding to the CSI is the first format.

With reference to the second possible implementation of the sixthaspect, in a third possible implementation of the sixth aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 2 and the PUCCH resource corresponding to the PUCCHformat 3; and

that the processor is specifically configured to determine, according toa quantity of carriers corresponding to the CSI, that the format of thePUCCH resource corresponding to the CSI is the first format isspecifically:

if the quantity of carriers is greater than a first quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 3; otherwise, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 2; or

that the processor is specifically configured to determine, according toa quantity of bits of the CSI, that the format of the PUCCH resourcecorresponding to the CSI is the first format is specifically:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 3; otherwise, determining that the format of the PUCCHresource corresponding to the CSI is the PUCCH format 2.

With reference to the second possible implementation of the sixthaspect, in a fourth possible implementation of the sixth aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 2 and the PUCCH resource corresponding to the PUCCHformat 4; and

that the processor is specifically configured to determine, according toa quantity of carriers corresponding to the CSI, that the format of thePUCCH resource corresponding to the CSI is the first format isspecifically:

if the quantity of carriers is greater than a first quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 4; otherwise, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 2; or

that the processor is specifically configured to determine, according toa quantity of bits of the CSI, that the format of the PUCCH resourcecorresponding to the CSI is the first format is specifically:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 4; otherwise, determining that the format of the PUCCHresource corresponding to the CSI is the PUCCH format 2.

With reference to the second possible implementation of the sixthaspect, in a fifth possible implementation of the sixth aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 3 and the PUCCH resource corresponding to the PUCCHformat 4; and

that the processor is specifically configured to determine, according toa quantity of carriers corresponding to the CSI, that the format of thePUCCH resource corresponding to the CSI is the first format isspecifically:

if the quantity of carriers is greater than a second quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 4; otherwise, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 3; or

that the processor is specifically configured to determine, according toa quantity of bits of the CSI, that the format of the PUCCH resourcecorresponding to the CSI is the first format is specifically:

if the quantity of bits is greater than a fourth quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 4; otherwise, determining that the format of the PUCCHresource corresponding to the CSI is the PUCCH format 3.

With reference to the second possible implementation of the sixthaspect, in a sixth possible implementation of the sixth aspect, the atleast two PUCCH resources include the PUCCH resource corresponding tothe PUCCH format 2, the PUCCH resource corresponding to the PUCCH format3, and the PUCCH resource corresponding to the PUCCH format 4; and

that the processor is specifically configured to determine, according toa quantity of carriers corresponding to the CSI, that the format of thePUCCH resource corresponding to the CSI is the first format isspecifically:

if the quantity of carriers is less than or equal to a first quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 2; or

if the quantity of carriers is greater than the first quantity and isless than or equal to a second quantity, determining that the format ofthe PUCCH resource corresponding to the CSI is the PUCCH format 3; or

if the quantity of carriers is greater than the second quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 4; or

that the processor is specifically configured to determine, according toa quantity of bits of the CSI, that the format of the PUCCH resourcecorresponding to the CSI is the first format is specifically:

if the quantity of bits is less than or equal to a third quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 2; or

if the quantity of bits is greater than the third quantity and is lessthan or equal to a fourth quantity, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 3; or

if the quantity of bits is greater than the fourth quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 4.

With reference to any one of the sixth aspect or the first possibleimplementation to the sixth possible implementation of the sixth aspect,in a seventh possible implementation of the sixth aspect, the processoris further configured to:

before the receiver receives the CSI carried on a first first-formatPUCCH resource, determine the first PUCCH resource from at least onefirst-format PUCCH resource corresponding to each of the one or moredownlink carrier groups to which the CSI belongs; and

determine to receive the CSI by using the first PUCCH resource.

With reference to the seventh possible implementation of the sixthaspect, in an eighth possible implementation of the sixth aspect, thatthe processor is specifically configured to determine the first PUCCHresource from at least one first-format PUCCH resource corresponding toeach of the one or more downlink carrier groups to which the CSI belongsis specifically:

determining the first PUCCH resource from the at least one PUCCHresource according to received information sent by the network device;or

determining, from the at least one PUCCH resource, a smallest-numberedPUCCH resource as the first PUCCH resource; or

determining, from the at least one PUCCH resource, a largest-numberedPUCCH resource as the first PUCCH resource; or

determining, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a smallest-numberedcarrier as the first PUCCH resource; or

determining, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a largest-numberedcarrier as the first PUCCH resource.

In the embodiments of the present invention, at least two PUCCHresources are configured for each downlink carrier group. CSI that needsto be reported in one uplink subframe may be obtained, and a format of acorresponding PUCCH resource is determined according to theto-be-reported CSI. For example, the determined format is referred to asa first format. Then, all of the to-be-reported CSI is reported afterbeing added to a first first-format PUCCH resource. Therefore, in theembodiments of the present invention, the CSI that needs to be reportedin one uplink subframe may be reported by occupying only one PUCCHresource. This greatly reduces PUCCH resource overheads and improves athroughput of an uplink system compared with a prior-art solution thateach CSI needs to occupy one PUCCH resource.

Moreover, in the prior art, if CSI of different carriers needs to bereported in one uplink subframe, only one piece of CSI can be selectedfor reporting, and other non-selected CSI is discarded. That is, CSIcorresponding to some carriers cannot be reported, and a base stationcannot perform effective downlink data scheduling for a downlink carriercorresponding to the unreported CSI. This causes performancedeterioration of a downlink system. However, after the technicalsolutions in the embodiments of the present invention are used, CSI thatneeds to be reported in one uplink subframe can be reported after beingadded to a same PUCCH resource. This avoids, as far as possible,discarding CSI, and ensures that CSI of all downlink carriers that needsto be reported can be reported, so that a base station can relativelyeffectively schedule the downlink carriers, thereby improvingperformance of the downlink system.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a main flowchart of a CSI reporting method according to anembodiment of the present invention;

FIG. 2 is a main flowchart of a CSI receiving method according to anembodiment of the present invention;

FIG. 3 is a structural block diagram of user equipment according to anembodiment of the present invention;

FIG. 4 is a structural block diagram of a network device according to anembodiment of the present invention;

FIG. 5 is a schematic structural diagram of user equipment according toan embodiment of the present invention; and

FIG. 6 is a schematic structural diagram of a network device accordingto an embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS

To make the objectives, technical solutions, and advantages of theembodiments of the present invention clearer, the following clearlydescribes the technical solutions in the embodiments of the presentinvention with reference to the accompanying drawings in the embodimentsof the present invention. Apparently, the described embodiments are apart rather than all of the embodiments of the present invention. Allother embodiments obtained by a person of ordinary skill in the artbased on the embodiments of the present invention without creativeefforts shall fall within the protection scope of the present invention.

Technologies described in this specification can be used in an LTE-Asystem and a subsequent evolved system of LTE-A.

In the embodiments of the present invention, a PUCCH resourcecorresponding to a PUCCH format (format) 2 generally supports 11 bits(bit), and a PUCCH resource corresponding to a PUCCH format 3 generallysupports 22 bits. A new PUCCH format may be introduced to the LTE R13,and the new PUCCH format is referred to as a PUCCH format 4 in theembodiments of the present invention. A PUCCH resource corresponding toa PUCCH format 4 can support a maximum of 128 bits or even up to 320bits. Certainly, if a PUCCH resource in another format is proposed in asubsequent LTE release, methods in the embodiments of the presentinvention can also be naturally applied to a new PUCCH resource. Aperson skilled in the art naturally knows how to use the methods in theembodiments of the present invention in practice, and make correspondingvariations.

In the embodiments of the present invention, CSI is periodic CSI, thatis, CSI that needs to be periodically reported. A maximum quantity ofbits of each piece of CSI is generally 11.

In the LTE-A system, an eNB (evolved base station) configures orreconfigures, by using semi-static RRC (radio resource control)signaling, a schedulable carrier set for LTE-A UE (user equipment)having a CA capability. Generally, a carrier set configured for UE isreferred to as a UE DL CC set (user equipment downlink component carrierset). A UE DL CC set corresponding to UE may include one or moredownlink carrier groups, and one carrier group may include one or moredownlink carriers. For convenience, a downlink carrier is referred to asa carrier for short in the embodiments of the present invention.

In addition, for power saving, a carrier activation (that is, enabling)and deactivation (that is, disabling) mechanism is further introducedbased on the semi-statically configured UE DL CC set. Except a downlinkprimary component carrier, all other component carriers may be activatedor deactivated according to a service requirement. Generally, except thedownlink primary component carrier, each newly configured downlinkcomponent carrier in the UE DL CC set may be in a deactivated state bydefault. If a current service rate of UE increases, the eNB may activateone or more carriers that are not activated in the UE DL CC set toperform data transmission. If the current service rate of the UEdecreases, the eNB may deactivate one or more activated carriers in theUE DL CC set except the downlink primary component carrier.

An example is used for description. It is assumed that an eNB configurestwo carriers CC1 and CC2 for a UE DL CC set of UE according to anaverage service volume of the UE or a capability of the UE. CC1 is adownlink primary component carrier of the UE. Within a period of time, adata transmission rate of the UE increases, the eNB may instruct, bysending activation signaling to the UE, the UE to enable CC2 in adeactivated state, so that CC2 and CC1 perform data transmission inparallel. Then, if the data transmission rate of the UE decreases, theeNB may instruct, by sending deactivation signaling to the UE, the UE todisable the activated CC2.

It should be noted that, in an existing LTE system, a carrier isreferred to as a serving cell. That is, a carrier in the embodiments ofthe present invention is referred to as a serving cell.

The embodiments of the present invention are described with reference toa network device and UE.

The network device is, for example, a base station (for example, anaccess point), and may be specifically a device that communicates with awireless terminal in an access network over an air interface by usingone or more sectors. The base station may be configured to performmutual conversion between a received over-the-air frame and an IPpacket, and serve as a router between the wireless terminal and the restportion of the access network. The rest portion of the access networkmay include an Internet Protocol (IP) network. The base station mayfurther coordinate attribute management of the air interface. Forexample, the base station may be an evolved base station (NodeB, eNB, ore-NodeB, evolved Node B) in LTE-A. This is not limited in the presentinvention.

UE may be a wireless terminal or a wired terminal. The wireless terminalmay be a device that provides voice and/or data connectivity for a user,a handheld device having a wireless connection function, or anotherprocessing device connected to a wireless modem. The wireless terminalmay communicate with one or more core networks through a radio accessnetwork (for example, RAN (Radio Access Network)). The wireless terminalmay be a mobile terminal, such as a mobile phone (also be referred to asa “cellular” phone), and a computer having a mobile terminal, such as aportable, pocket-sized, handheld, computer built-in, or in-vehiclemobile apparatus, which exchanges voice and/or data with the radioaccess network. For example, the wireless terminal may be a device suchas a PCS (personal communication service) phone, a cordless telephoneset, a SIP (Session Initiation Protocol) phone, a WLL (wireless localloop) station, or a PDA (personal digital assistant). The wirelessterminal may also be referred to as a system, a subscriber unit(Subscriber Unit), a subscriber station, a mobile station, a mobile, aremote station, an access point, a remote terminal, an access terminal,a user terminal, a user agent, a user device, or user equipment.

In addition, the terms “system” and “network” can usually be usedinterchangeably in this specification. The term “and/or” in thisspecification describes only an association relationship for describingassociated objects and represents that three relationships may exist.For example, A and/or B may represent the following three cases: Only Aexists, both A and B exist, and only B exists. In addition, thecharacter “/” in this specification generally indicates an “or”relationship between the associated objects unless otherwise specified.

In the following, the embodiments of the present invention are furtherdescribed in detail with reference to the accompanying drawings of thisspecification.

Referring to FIG. 1, an embodiment of the present invention provides aCSI reporting method. The method can be applied to UE. Main proceduresof the method are described as follows.

Step 101. Obtain CSI that is to be reported in an uplink subframe, wherethe to-be-reported CSI is corresponding to one or more downlink carriergroups, at least two PUCCH resources are configured for one downlinkcarrier group, and the at least two PUCCH resources have differentformats.

In this embodiment of the present invention, UE having a CA capabilitymay be corresponding to one or more downlink carrier groups. It may bedetermined that CSI corresponding to which carriers in each downlinkcarrier group corresponding to the UE needs to be reported in a sameuplink subframe.

For example, if the UE is corresponding to three downlink carriergroups: CG1, CG2, and CG3. There are two carriers in CG1: C1 and C2.There is only one carrier in CG2: C3. There are three carriers in CG3:C4, C5, and C6.

For example, the UE determines that CSI of C1, C3, and C4 in the threedownlink carrier groups needs to be reported in a same uplink subframe.It is equivalent to that the CSI that is to be reported by the UE iscorresponding to multiple downlink carrier groups.

Alternatively, for example, the UE determines that CSI of C1 and C4 inthe three downlink carrier groups needs to be reported in a same uplinksubframe. It is equivalent to that the CSI that is to be reported by theUE is corresponding to multiple downlink carrier groups.

Alternatively, for example, the UE determines that CSI of C4 and C5 inthe three downlink carrier groups needs to be reported in a same uplinksubframe. It is equivalent to that the CSI that is to be reported by theUE is corresponding to one carrier group.

Optionally, in this embodiment of the present invention, before theobtaining CSI that is to be reported in an uplink subframe, the methodfurther includes:

receiving PUCCH resources configured by a network device for eachdownlink carrier group corresponding to the UE, where the network deviceconfigures at least two PUCCH resources for each downlink carrier groupcorresponding to the UE.

Optionally, in this embodiment of the present invention, in the at leasttwo PUCCH resources configured by the network device for each downlinkcarrier group of the UE, a capacity of each PUCCH resource may begreater than or equal to a specific capacity. The specific capacity maybe, for example, 11 bits, or certainly, may be another value.

Optionally, in this embodiment of the present invention,

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format3; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 3 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2, a PUCCH resource corresponding to a PUCCH format 3,and a PUCCH resource corresponding to a PUCCH format 4.

In this embodiment of the present invention, the method may furtherinclude:

receiving an activation instruction or a deactivation instruction sentby the network device; and

if the activation instruction is received, activating a correspondingcarrier in a downlink carrier group of the UE according to theactivation instruction; or

if the deactivation instruction is received, disabling a correspondingcarrier in a downlink carrier group of the UE according to thedeactivation instruction.

In this embodiment of the present invention, the network device sends anactivation instruction or a deactivation instruction to the UE, and thenetwork device configures PUCCH resources for a downlink carrier groupof the UE. An implementation sequence between sending an activationinstruction or a deactivation instruction by the network device to theUE and configuring PUCCH resources for a downlink carrier group of theUE by the network device may be at random.

Certainly, only a carrier in an activated state may be used forreporting CSI, and a carrier in a disabled state does not need to beused for reporting CSI. That is, all carriers corresponding to theto-be-reported CSI that is obtained by the UE are in an activated state.

Step 102. Determine, according to the to-be-reported CSI, that a formatof a PUCCH resource corresponding to the to-be-reported CSI is a firstformat.

Specifically, the format of the PUCCH resource corresponding to theto-be-reported CSI may be determined according to a value of a specificparameter corresponding to the to-be-reported CSI. For example, thedetermined format is referred to as the first format.

Specifically, a correspondence between a value of a specific parametercorresponding to CSI and a format of a PUCCH resource may be pre-storedin the UE. The specific parameter corresponding to the CSI may be aquantity of carriers corresponding to the CSI, a quantity of bitscorresponding to the CSI, or the like. This is not limited in thepresent invention. A person skilled in the art naturally knows that thecorrespondence may have corresponding variations when the specificparameter corresponding to the CSI varies.

Optionally, when the specific parameter corresponding to the CSI varies,the UE determines the format of the PUCCH resource corresponding to theto-be-reported CSI in a different manner. Descriptions are separatelyprovided as follows.

1. The specific parameter corresponding to the CSI refers to a quantityof carriers corresponding to the CSI.

Optionally, in this embodiment of the present invention, thedetermining, according to the to-be-reported CSI, that a format of aPUCCH resource corresponding to the to-be-reported CSI is a first formatincludes:

determining, according to a quantity of carriers corresponding to theto-be-reported CSI, that the format of the PUCCH resource correspondingto the to-be-reported CSI is the first format.

Specifically, if the specific parameter corresponding to the CSI refersto the quantity of carriers corresponding to the CSI, a correspondencebetween a value of the specific parameter corresponding to the CSI andthe format of the PUCCH resource may be a correspondence between a rangeof the quantity of carriers corresponding to the CSI and the format ofthe PUCCH resource.

Optionally, if the at least two PUCCH resources include the PUCCHresource corresponding to the PUCCH format 2 and the PUCCH resourcecorresponding to the PUCCH format 3, the determining, according to aquantity of carriers corresponding to the to-be-reported CSI, that theformat of the PUCCH resource corresponding to the to-be-reported CSI isthe first format includes:

if the quantity of carriers is greater than a first quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 3; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 2.

In this embodiment of the present invention, for example, the firstquantity is 1. A capacity of the PUCCH resource corresponding to thePUCCH format 2 is 11 bits, a capacity of the PUCCH resourcecorresponding to the PUCCH format 3 is 22 bits, and one piece of CSIgenerally occupies 11 bits. Therefore, if the total quantity of carrierscorresponding to the to-be-reported CSI is greater than 1, it indicatesthat a quantity of the to-be-reported CSI is greater than 1 (generally,one carrier is corresponding to one piece of CSI). Apparently, the PUCCHresource corresponding to the PUCCH format 2 cannot be used fortransmitting all of the to-be-reported CSI. Therefore, in this case, thePUCCH resource corresponding to the PUCCH format 3 may be selected fortransmitting the to-be-reported CSI, to ensure, as far as possible, thatall of the CSI that needs to be reported in a same uplink subframe canbe transmitted. Alternatively, if the total quantity of carrierscorresponding to the to-be-reported CSI is less than or equal to 1, thePUCCH resource corresponding to the PUCCH format 2 can be used fortransmitting all the obtained CSI. In this case, there is no need toselect a larger-capacity PUCCH resource corresponding to the PUCCHformat 3, thereby saving network resources as far as possible.

In this embodiment of the present invention, at least two PUCCHresources are configured for each downlink carrier group. For example, aPUCCH-format-2 PUCCH resource and a PUCCH-format-3 PUCCH resource areconfigured for each downlink carrier group. PUCCH-format-2 PUCCHresources configured for different downlink carrier groups may be thesame or different. Similarly, PUCCH-format-3 PUCCH resources configuredfor different downlink carrier groups may be the same or different. Forexample, it is determined that CSI of K activated carriers needs to bereported in an uplink subframe n, and K pieces of CSI are correspondingto K downlink carrier groups. Then, K PUCCH-format-2 PUCCH resources maybe available for selection. That is, the UE needs to determine one PUCCHresource from the K PUCCH-format-2 PUCCH resources to transmit the Kpieces of CSI.

When determining the PUCCH resource, the UE may follow differentselection methods.

For example, the UE may determine a smallest-numbered PUCCH resourcethereof, a largest-numbered PUCCH resource thereof, a PUCCH resourcecorresponding to a smallest-numbered carrier in K activated carrierscorresponding to the K pieces of CSI, or a PUCCH resource correspondingto a largest-numbered carrier in K activated carriers corresponding tothe K pieces of CSI. Alternatively, a base station may send informationto the UE, to instruct the UE to specifically determine which PUCCHresource is used as the first PUCCH resource, or the UE may determinethe first PUCCH resource according to stipulation in a protocol or astandard.

Alternatively, the UE may select a PUCCH resource in a default mode, forexample, in a mode of default setting. If a PUCCH resource correspondingto the PUCCH format 3 or the PUCCH format 4 needs to be selected, it isdetermined that a PUCCH-format-3 PUCCH resource or a PUCCH-format-4PUCCH resource corresponding to a downlink primary component carrier isused as the PUCCH resource for transmitting the to-be-reported CSI. If aPUCCH resource corresponding to the PUCCH format 2 needs to bedetermined, the PUCCH-format-2 PUCCH resource of a downlink carriergroup corresponding to the CSI that needs to be reported is determined.In this embodiment of the present invention, the PUCCH-format-2 PUCCHresource of a downlink carrier group corresponding to the K (asdescribed above, K=1 is used as an example) pieces of CSI are directlydetermined for transmitting the K pieces of CSI.

Regardless of how the PUCCH resource is determined, a best manner isthat the PUCCH resource is determined according to stipulation in astandard or is determined by means of negotiation between the basestation and the UE in advance. In this way, the base station may alsoknow which PUCCH resource is specifically selected by the UE fortransmitting periodic CSI, thereby preventing, as far as possible, thebase station from performing blind detection on multiple PUCCHresources.

Optionally, in this embodiment of the present invention, if the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 2 and the PUCCH resource corresponding to the PUCCH format4, the determining, according to a quantity of carriers corresponding tothe to-be-reported CSI, that the format of the PUCCH resourcecorresponding to the to-be-reported CSI is the first format includes:

if the quantity of carriers is greater than a first quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 2.

In this embodiment of the present invention, for example, the firstquantity is 1. A capacity of the PUCCH resource corresponding to thePUCCH format 2 is 11 bits, a capacity of the PUCCH resourcecorresponding to the PUCCH format 4 is 128 bits or even up to 320 bits,and one piece of CSI generally occupies 11 bits. Therefore, if the totalquantity of carriers corresponding to the to-be-reported CSI is greaterthan 1, it indicates that a quantity of the to-be-reported CSI isgreater than 1 (generally, one carrier is corresponding to one piece ofCSI). Apparently, the PUCCH resource corresponding to the PUCCH format 2cannot be used for transmitting all of the to-be-reported CSI.Therefore, in this case, the PUCCH resource corresponding to the PUCCHformat 4 may be selected for transmitting the to-be-reported CSI, toensure, as far as possible, that all of the CSI that needs to bereported in one uplink subframe can be transmitted. Alternatively, ifthe total quantity of carriers corresponding to the to-be-reported CSIis less than or equal to 1, the PUCCH resource corresponding to thePUCCH format 2 can be used for transmitting all of the to-be-reportedCSI. In this case, there is no need to select a larger-capacity PUCCHresource corresponding to the PUCCH format 4, thereby saving networkresources as far as possible.

Similarly, in this embodiment of the present invention, for example, aPUCCH-format-2 PUCCH resource and a PUCCH-format-4 PUCCH resource areconfigured for each downlink carrier group. PUCCH-format-2 PUCCHresources configured for different downlink carrier groups may be thesame or different. Similarly, PUCCH-format-4 PUCCH resources configuredfor different downlink carrier groups may be the same or different. Forexample, it is determined that CSI of K activated carriers needs to bereported in an uplink subframe n, and K pieces of CSI are correspondingto K downlink carrier groups. Then, K PUCCH-format-4 PUCCH resources maybe available for selection. That is, the UE needs to determine one PUCCHresource from the K PUCCH-format-4 PUCCH resources to transmit the Kpieces of CSI. For a specific determining manner of the UE, refer to theforegoing descriptions (that is, descriptions about how the UEdetermines one PUCCH resource from K PUCCH-format-2 PUCCH resourcescorresponding to the K downlink carrier groups). Details are not furtherdescribed herein.

Optionally, in this embodiment of the present invention, if the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 3 and the PUCCH resource corresponding to the PUCCH format4, the determining, according to a quantity of carriers corresponding tothe to-be-reported CSI, that the format of the PUCCH resourcecorresponding to the to-be-reported CSI is the first format includes:

if the quantity of carriers is greater than a second quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 3.

In this embodiment of the present invention, for example, the secondquantity is 2. A capacity of the PUCCH resource corresponding to thePUCCH format 3 is 22 bits, a capacity of the PUCCH resourcecorresponding to the PUCCH format 4 is 128 bits or even up to 320 bits,and one piece of CSI generally occupies 11 bits. Therefore, if the totalquantity of carriers corresponding to the to-be-reported CSI is greaterthan 2, it indicates that a quantity of the to-be-reported CSI isgreater than 2. Apparently, the PUCCH resource corresponding to thePUCCH format 3 cannot be used for transmitting all of the to-be-reportedCSI. Therefore, in this case, the PUCCH resource corresponding to thePUCCH format 4 may be selected for transmitting the to-be-reported CSI,to ensure, as far as possible, that all of the CSI that needs to bereported in one uplink subframe can be transmitted. Alternatively, ifthe total quantity of carriers corresponding to the to-be-reported CSIis less than or equal to 2, the PUCCH resource corresponding to thePUCCH format 3 can be used for transmitting all of the to-be-reportedCSI. In this case, there is no need to select a larger-capacity PUCCHresource corresponding to the PUCCH format 4, thereby saving networkresources as far as possible.

Similarly, in this embodiment of the present invention, for example, aPUCCH-format-3 PUCCH resource and a PUCCH-format-4 PUCCH resource areconfigured for each downlink carrier group. PUCCH-format-3 PUCCHresources configured for different downlink carrier groups may be thesame or different. Similarly, PUCCH-format-4 PUCCH resources configuredfor different downlink carrier groups may be the same or different. Forexample, it is determined that CSI of K activated carriers needs to bereported in an uplink subframe n, and K pieces of CSI are correspondingto K downlink carrier groups. Then, K PUCCH-format-3 PUCCH resources maybe available for selection. That is, the UE needs to determine one PUCCHresource from the K PUCCH-format-3 PUCCH resources to transmit the Kpieces of CSI. For a specific determining manner of the UE, refer to theforegoing descriptions (that is, the foregoing descriptions about howthe UE determines one PUCCH resource from K PUCCH-format-2 PUCCHresources corresponding to the K downlink carrier groups). Details arenot further described herein.

Optionally, in this embodiment of the present invention, if the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 2, the PUCCH resource corresponding to the PUCCH format 3,and the PUCCH resource corresponding to the PUCCH format 4, thedetermining, according to a quantity of carriers of the to-be-reportedCSI, that the format of the PUCCH resource corresponding to the CSI isthe first format includes:

if the quantity of carriers is less than or equal to a first quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 2; or

if the quantity of carriers is greater than the first quantity and isless than or equal to a second quantity, determining that the format ofthe PUCCH resource corresponding to the to-be-reported CSI is the PUCCHformat 3; or

if the quantity of carriers is greater than the second quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4.

In this embodiment of the present invention, for example, the firstquantity is 1, and the second quantity is 2. A capacity of the PUCCHresource corresponding to the PUCCH format 2 is 11 bits, a capacity ofthe PUCCH resource corresponding to the PUCCH format 3 is 22 bits, acapacity of the PUCCH resource corresponding to the PUCCH format 4 is128 bits or even up to 320 bits, and one piece of CSI generally occupies11 bits. Therefore, if the total quantity of carriers corresponding tothe to-be-reported CSI is less than or equal to 1 (Certainly, thequantity of carriers is not a decimal. If the quantity is less than orequal to 1, an only case is that the quantity is 1. If the quantity is0, it indicates that no CSI is to be reported, and a subsequentprocedure is not performed. Therefore, the case when the quantity is 0is not described in this embodiment of the present invention), itindicates that a quantity of to-be-reported CSI is less than or equalto 1. In this case, the PUCCH resource corresponding to the PUCCH format2 can be used for transmitting the to-be-reported CSI, without wastinganother larger-capacity PUCCH resource. This saves network resources. Ifthe total quantity of carriers corresponding to the to-be-reported CSIis greater than 1 and less than and equal to 2 (similarly, because thequantity is not a decimal, it indicates that the quantity is 2 in thiscase), it indicates that a quantity of to-be-reported CSI is greaterthan 1 and less than and equal to 2. In this case, the PUCCH resourcecorresponding to the PUCCH format 3 can be used for transmitting theto-be-reported CSI, without wasting another larger-capacity PUCCHresource. This saves network resources. If the total quantity ofcarriers corresponding to the to-be-reported CSI is greater than 2, itindicates that a quantity of the to-be-reported CSI is greater than 2.Apparently, neither the PUCCH resource corresponding to the PUCCH format2 nor the PUCCH resource corresponding to the PUCCH format 3 can be usedfor transmitting all of the to-be-reported CSI. Therefore, in this case,the PUCCH resource corresponding to the PUCCH format 4 may be selectedfor transmitting the to-be-reported CSI, to ensure, as far as possible,that all of the CSI that needs to be reported in one uplink subframe canbe transmitted.

It can be learned that, in this embodiment of the present invention, CSIthat needs to be reported in one uplink subframe can be transmitted byusing one PUCCH resource. This saves PUCCH resources, avoids that CSIthat needs to be transmitted is discarded during transmission, andensures, as far as possible, that CSI of all downlink carriers can betransmitted to a base station, so that the base station can relativelyeffectively schedule a downlink carrier. In addition, PUCCH resources inat least two PUCCH formats are configured for each downlink carriergroup, and an appropriate PUCCH resource is determined according to aspecific condition of determining, for transmitting to-be-reported CSI.This ensures that CSI that needs to be transmitted can be transmittednormally, and saves PUCCH resources as far as possible. For example,when a smaller-capacity PUCCH resource can be used, a larger-capacityPUCCH resource is not selected for use. Therefore, a network operationrate is increased.

Similarly, in this embodiment of the present invention, for example, aPUCCH-format-2 PUCCH resource, a PUCCH-format-3 PUCCH resource, and aPUCCH-format-4 PUCCH resource are configured for each downlink carriergroup. PUCCH-format-2 PUCCH resources configured for different downlinkcarrier groups may be the same or different, and PUCCH-format-3 PUCCHresources configured for different downlink carrier groups may be thesame or different. Similarly, PUCCH-format-4 PUCCH resources configuredfor different downlink carrier groups may be the same or different. Forexample, it is determined that CSI of K activated carriers needs to bereported in an uplink subframe n, and K pieces of CSI are correspondingto K downlink carrier groups. Then, K PUCCH-format-3 PUCCH resources maybe available for selection. That is, the UE needs to determine one PUCCHresource from the K PUCCH-format-3 PUCCH resources to transmit the Kpieces of CSI. For a specific determining manner of the UE, refer to theforegoing descriptions (that is, the foregoing descriptions about howthe UE determines one PUCCH resource from K PUCCH-format-2 PUCCHresources corresponding to the K downlink carrier groups). Details arenot further described herein.

2. The specific parameter corresponding to the CSI refers to a quantityof bits corresponding to the CSI.

Optionally, in this embodiment of the present invention, thedetermining, according to the to-be-reported CSI, that a format of aPUCCH resource corresponding to the to-be-reported CSI is a first formatincludes:

determining, according to a quantity of bits of the to-be-reported CSI,that the format of the PUCCH resource corresponding to theto-be-reported CSI is the first format.

Specifically, if the specific parameter corresponding to the CSI refersto the quantity of bits of the CSI, a correspondence between a value ofthe specific parameter corresponding to the CSI and the format of thePUCCH resource may be a correspondence between a range of the quantityof bits of the CSI and the format of the PUCCH resource.

That is, the specific parameter corresponding to the to-be-reported CSIis the total quantity of bits corresponding to the to-be-reported CSI.For example, a total of three pieces of CSI are obtained, and thespecific parameter corresponding to the to-be-reported CSI is a totalquantity of bits corresponding to the three pieces of CSI.

Optionally, in this embodiment of the present invention, if the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 2 and the PUCCH resource corresponding to the PUCCH format3, the determining, according to a quantity of bits of theto-be-reported CSI, that the format of the PUCCH resource correspondingto the to-be-reported CSI is the first format includes:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 3; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 2.

In this embodiment of the present invention, for example, the thirdquantity is 11. A capacity of the PUCCH resource corresponding to thePUCCH format 2 is 11 bits, a capacity of the PUCCH resourcecorresponding to the PUCCH format 3 is 22 bits, and one piece of CSIgenerally occupies 11 bits. Therefore, if the total quantity of bitscorresponding to the to-be-reported CSI is greater than 11, the PUCCHresource corresponding to the PUCCH format 2 apparently cannot be usedfor transmitting all of the to-be-reported CSI. Therefore, in this case,the PUCCH resource corresponding to the PUCCH format 3 may be selectedfor transmitting the to-be-reported CSI, to ensure, as far as possible,that all of the CSI that needs to be reported in one uplink subframe canbe transmitted. Alternatively, if the total quantity of bitscorresponding to the to-be-reported CSI is less than or equal to 11, thePUCCH resource corresponding to the PUCCH format 2 can be used fortransmitting all of the to-be-reported CSI. In this case, there is noneed to select a larger-capacity PUCCH resource corresponding to thePUCCH format 3, thereby saving network resources as far as possible.

Similarly, it is determined that there are M bits of CSI that needs tobe reported in total in an uplink subframe n. For example, M=22. Mpieces of CSI are corresponding to M downlink carrier groups. Then, MPUCCH-format-3 PUCCH resources may be available for selection. That is,the UE needs to determine one PUCCH resource from the M PUCCH-format-3PUCCH resources to transmit the M pieces of CSI. For a specificselection manner of the UE, refer to the foregoing descriptions. Detailsare not further described herein.

Optionally, in this embodiment of the present invention, if the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 2 and the PUCCH resource corresponding to the PUCCH format4, the determining, according to a quantity of bits of theto-be-reported CSI, that the format of the PUCCH resource correspondingto the to-be-reported CSI is the first format includes:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 2.

In this embodiment of the present invention, for example, the thirdquantity is 11. A capacity of the PUCCH resource corresponding to thePUCCH format 2 is 11 bits, a capacity of the PUCCH resourcecorresponding to the PUCCH format 4 is 128 bits or even up to 320 bits,and one piece of CSI generally occupies 11 bits. Therefore, if the totalquantity of bits corresponding to the to-be-reported CSI is greater than11, the PUCCH resource corresponding to the PUCCH format 2 apparentlycannot be used for transmitting all of the to-be-reported CSI.Therefore, in this case, the PUCCH resource corresponding to the PUCCHformat 4 may be selected for transmitting the to-be-reported CSI, toensure, as far as possible, that all of the CSI that needs to bereported in one uplink subframe can be transmitted. Alternatively, ifthe total quantity of bits corresponding to the to-be-reported CSI isless than or equal to 11, the PUCCH resource corresponding to the PUCCHformat 2 can be used for transmitting all of the to-be-reported CSI. Inthis case, there is no need to select a larger-capacity PUCCH resourcecorresponding to the PUCCH format 4, thereby saving network resources asfar as possible.

Similarly, it is determined that there are M bits of CSI that needs tobe reported in total in a same uplink subframe n. M pieces of CSI arecorresponding to M downlink carrier groups. Then, M PUCCH-format-4 PUCCHresources may be available for selection. That is, the UE needs toselect one PUCCH resource from the M PUCCH-format-4 PUCCH resources totransmit the M pieces of CSI. For a specific selection manner of the UE,refer to the foregoing descriptions. Details are not further describedherein.

Optionally, in this embodiment of the present invention, if the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 3 and the PUCCH resource corresponding to the PUCCH format4, the determining, according to a quantity of bits of theto-be-reported CSI, that the format of the PUCCH resource correspondingto the to-be-reported CSI is the first format includes:

if the quantity of bits is greater than a fourth quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 3.

In this embodiment of the present invention, for example, the fourthquantity is 22. A capacity of the PUCCH resource corresponding to thePUCCH format 3 is 22 bits, a capacity of the PUCCH resourcecorresponding to the PUCCH format 4 is 128 bits or even up to 320 bits,and one piece of CSI generally occupies 11 bits. Therefore, if the totalquantity of carriers corresponding to the to-be-reported CSI is greaterthan 22, the PUCCH resource corresponding to the PUCCH format 3apparently cannot be used for transmitting all of the to-be-reportedCSI. Therefore, in this case, the PUCCH resource corresponding to thePUCCH format 4 may be selected for transmitting the to-be-reported CSI,to ensure, as far as possible, that all of the CSI that needs to bereported in one uplink subframe can be transmitted. Alternatively, ifthe total quantity of bits corresponding to the to-be-reported CSI isless than or equal to 22, the PUCCH resource corresponding to the PUCCHformat 3 can be used for transmitting all of the to-be-reported CSI. Inthis case, there is no need to select a larger-capacity PUCCH resourcecorresponding to the PUCCH format 4, thereby saving network resources asfar as possible.

Similarly, it is determined that there are M bits of CSI that needs tobe reported in total in an uplink subframe n. M pieces of CSI arecorresponding to M downlink carrier groups. Then, M PUCCH-format-4 PUCCHresources may be available for selection. That is, the UE needs todetermine one PUCCH resource from the M PUCCH-format-4 PUCCH resourcesto transmit the M pieces of CSI. For a specific selection manner of theUE, refer to the foregoing descriptions. Details are not furtherdescribed herein.

Optionally, in this embodiment of the present invention, if the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 2, the PUCCH resource corresponding to the PUCCH format 3,and the PUCCH resource corresponding to the PUCCH format 4, thedetermining, according to a quantity of bits of the to-be-reported CSI,that the format of the PUCCH resource corresponding to the CSI is thefirst format includes:

if the quantity of bits is less than or equal to a third quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 2; or

if the quantity of bits is greater than the third quantity and is lessthan or equal to a fourth quantity, determining that the format of thePUCCH resource corresponding to the to-be-reported CSI is the PUCCHformat 3; or

if the quantity of bits is greater than the fourth quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4.

In this embodiment of the present invention, for example, the thirdquantity is 11, and the fourth quantity is 22. A capacity of the PUCCHresource corresponding to the PUCCH format 2 is 11 bits, a capacity ofthe PUCCH resource corresponding to the PUCCH format 3 is 22 bits, acapacity of the PUCCH resource corresponding to the PUCCH format 4 is128 bits or even up to 320 bits, and one piece of CSI generally occupies11 bits. Therefore, if the total quantity of bits corresponding to theto-be-reported CSI is less than or equal to 11, the PUCCH resourcecorresponding to the PUCCH format 2 can be used for transmitting theto-be-reported CSI, without wasting another larger-capacity PUCCHresource. This saves network resources. If the total quantity of bitscorresponding to to-be-reported CSI is greater than 11 and is less thanor equal to 22, the PUCCH resource corresponding to the PUCCH format 3can be used for transmitting to-be-reported CSI, without wasting anotherlarger-capacity PUCCH resource. This saves network resources. If thetotal quantity of bits corresponding to the to-be-reported CSI isgreater than 22, neither the PUCCH resource corresponding to the PUCCHformat 2 nor the PUCCH resource corresponding to the PUCCH format 3apparently can be used for transmitting all of the to-be-reported CSI.Therefore, in this case, the PUCCH resource corresponding to the PUCCHformat 4 may be selected for transmitting the to-be-reported CSI, toensure, as far as possible, that all of the CSI that needs to bereported in one uplink subframe can be transmitted.

It can be learned that, in this embodiment of the present invention, CSIthat needs to be reported in one uplink subframe can be transmitted byusing one PUCCH resource. This saves PUCCH resources, avoids that CSIthat needs to be transmitted is discarded during transmission, andensures, as far as possible, that CSI of all downlink carriers can betransmitted to a base station, so that the base station can relativelyeffectively schedule a downlink carrier. In addition, PUCCH resources inat least two PUCCH formats are configured for each downlink carriergroup, and an appropriate PUCCH resource is selected according to aspecific condition of determining, for transmitting to-be-reported CSI.This ensures that CSI that needs to be transmitted can be transmittednormally, and saves PUCCH resources as far as possible. For example,when a smaller-capacity PUCCH resource can be used, a larger-capacityPUCCH resource is not selected for use. Therefore, a network operationrate is increased.

Similarly, it is determined that there are M bits of CSI that needs tobe reported in total in an uplink subframe n. M pieces of CSI arecorresponding to M downlink carrier groups. Then, M PUCCH-format-4 PUCCHresources may be available for selection. That is, the UE needs todetermine one PUCCH resource from the M PUCCH-format-4 PUCCH resourcesto transmit the M pieces of CSI. For a specific selection manner of theUE, refer to the foregoing descriptions. Details are not furtherdescribed herein.

Step 103. Add the to-be-reported CSI to a first first-format PUCCHresource, and report the to-be-reported CSI.

In this embodiment of the present invention, for example, a PUCCHresource selected by the UE is referred to as the first PUCCH resource.That is, the UE needs to use the first PUCCH resource to report the CSI.UE may add all obtained CSI to the first PUCCH resource, and report theCSI.

Optionally, in this embodiment of the present invention, the adding theto-be-reported CSI to a first first-format PUCCH resource, and reportingthe to-be-reported CSI includes:

determining the first PUCCH resource from at least one first-formatPUCCH resource corresponding to each of the one or more downlink carriergroups to which the to-be-reported CSI belongs; and

adding the to-be-reported CSI to the first PUCCH resource, and reportingthe to-be-reported CSI.

Optionally, in this embodiment of the present invention, the determiningthe first PUCCH resource from at least one first-format PUCCH resourcecorresponding to each of the one or more downlink carrier groups towhich the to-be-reported CSI belongs includes:

determining the first PUCCH resource from the at least one PUCCHresource according to received information sent by the network device;or

determining, from the at least one PUCCH resource, a smallest-numberedPUCCH resource as the first PUCCH resource; or

determining, from the at least one PUCCH resource, a largest-numberedPUCCH resource as the first PUCCH resource; or

determining, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a smallest-numberedcarrier as the first PUCCH resource; or

determining, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a largest-numberedcarrier as the first PUCCH resource.

A specific selection manner has been described in the foregoing. Detailsare not further described herein.

Referring to FIG. 2, based on a same inventive concept, an embodiment ofthe present invention provides a CSI receiving method. The method may beapplied to a network device. For example, the network device may be abase station. Main procedures of the method are described as follows.

Step 201. Determine CSI that is to be reported by user equipment in anuplink subframe, where the CSI is corresponding to one or more downlinkcarrier groups, at least two PUCCH resources are configured for onedownlink carrier group, and the at least two PUCCH resources havedifferent formats.

In this embodiment of the present invention, referring to procedures ofFIG. 1, it can be learned that UE adds, to one PUCCH resource, CSI thatis to be reported, and reports the CSI. This greatly reduces PUCCHresource overheads. Specific implementation processes of obtaining CSIand determining a PUCCH resource by the UE, and the like have beendescribed in the procedures of FIG. 1.

The base station knows which CSI is reported by the UE in advance.

Optionally, in this embodiment of the present invention, before thedetermining CSI that is to be reported by user equipment in an uplinksubframe, the method may further include:

configuring the at least two PUCCH resources for each downlink carriergroup of the UE.

That is, PUCCH resources of a downlink carrier group of the UE arepre-configured by the base station.

Optionally, in this embodiment of the present invention, the method mayfurther include:

sending an activation instruction or a deactivation instruction to theUE.

The activation instruction is used to instruct the UE to activate acorresponding carrier in a downlink carrier group of the UE. Thedeactivation instruction is used to instruct the UE to disable acorresponding carrier in a downlink carrier group of the UE.

In this embodiment of the present invention, the base station sends anactivation instruction or a deactivation instruction to the UE, and thebase station configures PUCCH resources for a downlink carrier group ofthe UE. An implementation sequence between sending an activationinstruction or a deactivation instruction by the base station to the UEand configuring PUCCH resources for a downlink carrier group of the UEby the base station may be at random.

Optionally, in this embodiment of the present invention,

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format3; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 3 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2, a PUCCH resource corresponding to a PUCCH format 3,and a PUCCH resource corresponding to a PUCCH format 4.

Step 202. Determine, according to the CSI, that a format of a PUCCHresource corresponding to the CSI is a first format.

Specifically, the format of the PUCCH resource corresponding to theto-be-reported CSI may be determined according to a value of a specificparameter corresponding to the to-be-reported CSI. For example, thedetermined format is referred to as the first format.

Specifically, a correspondence between a value of a specific parametercorresponding to CSI and a format of a PUCCH resource may be pre-storedin the base station. The specific parameter corresponding to the CSI maybe a quantity of carriers corresponding to the CSI, a quantity of bitscorresponding to the CSI, or the like. This is not limited in thepresent invention. A person skilled in the art naturally knows that thecorrespondence may have corresponding variations when the specificparameter corresponding to the CSI varies.

Optionally, when the specific parameter corresponding to the CSI varies,the base station determines the format of the PUCCH resourcecorresponding to the to-be-reported CSI in a different manner.

1. The specific parameter corresponding to the CSI refers to a quantityof carriers corresponding to the CSI.

Optionally, in this embodiment of the present invention, thedetermining, according to the CSI, that a format of a PUCCH resourcecorresponding to the CSI is a first format includes:

determining, according to a quantity of carriers corresponding to theCSI, that the format of the PUCCH resource corresponding to the CSI isthe first format.

Optionally, in this embodiment of the present invention, if the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 2 and the PUCCH resource corresponding to the PUCCH format3, the determining, according to a quantity of carriers corresponding tothe CSI, that the format of the PUCCH resource corresponding to the CSIis the first format includes:

if the quantity of carriers is greater than a first quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 3; otherwise, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 2;

Optionally, in this embodiment of the present invention, if the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 2 and the PUCCH resource corresponding to the PUCCH format4, the determining, according to a quantity of carriers corresponding tothe CSI, that the format of the PUCCH resource corresponding to the CSIis the first format includes:

if the quantity of carriers is greater than a first quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 4; otherwise, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 2.

Optionally, in this embodiment of the present invention, if the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 3 and the PUCCH resource corresponding to the PUCCH format4, the determining, according to a quantity of carriers corresponding tothe CSI, that the format of the PUCCH resource corresponding to the CSIis the first format includes:

if the quantity of carriers is greater than a second quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 4; otherwise, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 3;

Optionally, in this embodiment of the present invention, if the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 2, the PUCCH resource corresponding to the PUCCH format 3,and the PUCCH resource corresponding to the PUCCH format 4, thedetermining, according to a quantity of carriers corresponding to theCSI, that the format of the PUCCH resource corresponding to the CSI isthe first format includes:

if the quantity of carriers is less than or equal to a first quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 2; or

if the quantity of carriers is greater than the first quantity and isless than or equal to a second quantity, determining that the format ofthe PUCCH resource corresponding to the CSI is the PUCCH format 3; or

if the quantity of carriers is greater than the second quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 4.

2. The specific parameter corresponding to the CSI refers to a quantityof bits corresponding to the CSI.

Optionally, in this embodiment of the present invention, thedetermining, according to the CSI, that a format of a PUCCH resourcecorresponding to the CSI is a first format includes:

determining, according to a quantity of bits of the CSI, that the formatof the PUCCH resource corresponding to the CSI is the first format.

Optionally, in this embodiment of the present invention, if the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 2 and the PUCCH resource corresponding to the PUCCH format3, the determining, according to a quantity of bits of the CSI, that theformat of the PUCCH resource corresponding to the CSI is the firstformat includes:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 3; otherwise, determining that the format of the PUCCHresource corresponding to the CSI is the PUCCH format 2.

Optionally, in this embodiment of the present invention, if the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 2 and the PUCCH resource corresponding to the PUCCH format4, the determining, according to a quantity of bits of the CSI, that theformat of the PUCCH resource corresponding to the CSI is the firstformat includes:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 4; otherwise, determining that the format of the PUCCHresource corresponding to the CSI is the PUCCH format 2.

Optionally, in this embodiment of the present invention, if the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 3 and the PUCCH resource corresponding to the PUCCH format4, the determining, according to a quantity of bits of the CSI, that theformat of the PUCCH resource corresponding to the CSI is the firstformat includes:

if the quantity of bits is greater than a fourth quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 4; otherwise, determining that the format of the PUCCHresource corresponding to the CSI is the PUCCH format 3.

Optionally, in this embodiment of the present invention, if the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 2, the PUCCH resource corresponding to the PUCCH format 3,and the PUCCH resource corresponding to the PUCCH format 4, thedetermining, according to a quantity of bits of the CSI, that the formatof the PUCCH resource corresponding to the CSI is the first formatincludes:

if the quantity of bits is less than or equal to a third quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 2; or

if the quantity of bits is greater than the third quantity and is lessthan or equal to a fourth quantity, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 3; or

if the quantity of bits is greater than the fourth quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 4.

Specific implementations and examples related to the several differentcases in the foregoing have been described in the procedures of FIG. 1.That is, the base station and UE select a PUCCH resource forto-be-reported CSI basically in a same processing manner.

Step 203. Receive the CSI carried on a first first-format PUCCHresource.

In this embodiment of the present invention, the PUCCH resource that isfinally selected by the UE is referred to as the first PUCCH resource.Certainly, the base station and the UE have a same selection manner.Therefore, a resource that is finally selected by the base station isalso the first PUCCH resource. After selecting the first PUCCH resource,the UE reports the to-be-reported CSI on the first PUCCH resource.Because the base station knows that the UE reports the CSI by using thefirst PUCCH resource, the base station directly receives the CSI byusing the first PUCCH resource. This prevents the base station fromperforming blind detection on different PUCCH resources.

Optionally, in this embodiment, before the receiving the CSI carried ona first first-format PUCCH resource, the method further includes:

determining the first PUCCH resource from at least one first-formatPUCCH resource corresponding to each of the one or more downlink carriergroups to which the CSI belongs; and

determining to receive the CSI by using the first PUCCH resource.

Optionally, in this embodiment of the present invention, the determiningthe first PUCCH resource from at least one first-format PUCCH resourcecorresponding to each of the one or more downlink carrier groups towhich the CSI belongs includes:

determining the first PUCCH resource from the at least one PUCCHresource according to received information sent by the network device;or

determining, from the at least one PUCCH resource, a smallest-numberedPUCCH resource as the first PUCCH resource; or

determining, from the at least one PUCCH resource, a largest-numberedPUCCH resource as the first PUCCH resource; or

determining, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a smallest-numberedcarrier as the first PUCCH resource; or

determining, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a largest-numberedcarrier as the first PUCCH resource.

For a specific manner, refer to descriptions in the procedures ofFIG. 1. In addition, for all those not specifically described in theprocedures of FIG. 2, refer to the procedures of FIG. 1.

In this embodiment of the present invention, at least two PUCCHresources are configured for each downlink carrier group. CSI that needsto be reported in one uplink subframe may be obtained, and a format of acorresponding PUCCH resource is determined according to theto-be-reported CSI. For example, the determined format is referred to asa first format. Then, all of the to-be-reported CSI is reported afterbeing added to a first first-format PUCCH resource. Therefore, in thisembodiment of the present invention, the CSI that needs to be reportedin one uplink subframe may be reported by occupying only one PUCCHresource. This greatly reduces PUCCH resource overheads and improves athroughput of an uplink system compared with a prior-art solution thateach CSI needs to occupy one PUCCH resource.

Moreover, in the prior art, if CSI of different carriers needs to bereported in one uplink subframe, only one piece of CSI can be selectedfor reporting, and other non-selected CSI is discarded. That is, CSIcorresponding to some carriers cannot be reported, and a base stationcannot perform effective downlink data scheduling for a downlink carriercorresponding to the unreported CSI. This causes performancedeterioration of a downlink system. However, after the technicalsolution in this embodiment of the present invention is used, CSI thatneeds to be reported in one uplink subframe can be reported after beingadded to a same PUCCH resource. This avoids, as far as possible,discarding CSI, and ensures that CSI of all downlink carriers that needsto be reported can be reported, so that a base station can relativelyeffectively schedule the downlink carriers, thereby improvingperformance of the downlink system.

Moreover, in this embodiment of the present invention, the base stationselects a PUCCH resource in a same manner as UE, and the base stationand the UE select a same PUCCH resource. Therefore, the base stationknows which PUCCH resource is used by the UE to transmit CSI, and candirectly receive the CSI on the PUCCH resource. This prevents the basestation from performing blind detection, and reduces load of the basestation.

In the following, apparatuses in embodiments of the present inventionare described with reference to the accompanying drawings.

Referring to FIG. 3, based on a same inventive concept, an embodiment ofthe present invention provides user equipment. The user equipment mayinclude an obtaining module 301, a determining module 302, and a sendingmodule 303.

The obtaining module 301 is configured to obtain channel stateinformation CSI that is to be reported in an uplink subframe. Theto-be-reported CSI is corresponding to one or more downlink carriergroups. At least two physical uplink control channel PUCCH resources areconfigured for one downlink carrier group. The at least two PUCCHresources have different formats.

The determining module 302 is configured to determine, according to theto-be-reported CSI, that a format of a PUCCH resource corresponding tothe to-be-reported CSI is a first format.

The sending module 303 is configured to add the to-be-reported CSI to afirst first-format PUCCH resource, and report the to-be-reported CSI.

Optionally, in this embodiment of the present invention,

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format3; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 3 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2, a PUCCH resource corresponding to a PUCCH format 3,and a PUCCH resource corresponding to a PUCCH format 4.

Optionally, in this embodiment of the present invention, the determiningmodule 302 is specifically configured to:

determine, according to a quantity of carriers corresponding to theto-be-reported CSI, that the format of the PUCCH resource correspondingto the to-be-reported CSI is the first format; or

determine, according to a quantity of bits of the to-be-reported CSI,that the format of the PUCCH resource corresponding to theto-be-reported CSI is the first format.

Optionally, in this embodiment of the present invention, the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 2 and the PUCCH resource corresponding to the PUCCH format3; and

that the determining module 302 is specifically configured to determine,according to a quantity of carriers corresponding to the to-be-reportedCSI, that the format of the PUCCH resource corresponding to theto-be-reported CSI is the first format is specifically: if the quantityof carriers is greater than a first quantity, determining that theformat of the PUCCH resource corresponding to the to-be-reported CSI isthe PUCCH format 3; otherwise, determining that the format of the PUCCHresource corresponding to the to-be-reported CSI is the PUCCH format 2;or

that the determining module 302 is specifically configured to determine,according to a quantity of bits of the to-be-reported CSI, that theformat of the PUCCH resource corresponding to the to-be-reported CSI isthe first format is specifically:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 3;

otherwise, determining that the format of the PUCCH resourcecorresponding to the to-be-reported CSI is the PUCCH format 2.

Optionally, in this embodiment of the present invention, the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 2 and the PUCCH resource corresponding to the PUCCH format4; and

that the determining module 302 is specifically configured to determine,according to a quantity of carriers corresponding to the to-be-reportedCSI, that the format of the PUCCH resource corresponding to theto-be-reported CSI is the first format is specifically:

if the quantity of carriers is greater than a first quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 2; or

that the determining module 302 is specifically configured to determine,according to a quantity of bits of the to-be-reported CSI, that theformat of the PUCCH resource corresponding to the to-be-reported CSI isthe first format is specifically:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 2.

Optionally, in this embodiment of the present invention, the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 3 and the PUCCH resource corresponding to the PUCCH format4; and

that the determining module 302 is specifically configured to determine,according to a quantity of carriers corresponding to the to-be-reportedCSI, that the format of the PUCCH resource corresponding to theto-be-reported CSI is the first format is specifically:

if the quantity of carriers is greater than a second quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 3; or

that the determining module 302 is specifically configured to determine,according to a quantity of bits of the to-be-reported CSI, that theformat of the PUCCH resource corresponding to the to-be-reported CSI isthe first format is specifically:

if the quantity of bits is greater than a fourth quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4;

otherwise, determining that the format of the PUCCH resourcecorresponding to the to-be-reported CSI is the PUCCH format 3.

Optionally, in this embodiment of the present invention, the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 2, the PUCCH resource corresponding to the PUCCH format 3,and the PUCCH resource corresponding to the PUCCH format 4; and

that the determining module 302 is specifically configured to determine,according to a quantity of carriers corresponding to the to-be-reportedCSI, that the format of the PUCCH resource corresponding to theto-be-reported CSI is the first format is specifically:

if the quantity of carriers is less than or equal to a first quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 2; or

if the quantity of carriers is greater than the first quantity and isless than or equal to a second quantity, determining that the format ofthe PUCCH resource corresponding to the to-be-reported CSI is the PUCCHformat 3; or

if the quantity of carriers is greater than the second quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; or

that the determining module 302 is specifically configured to determine,according to a quantity of bits of the to-be-reported CSI, that theformat of the PUCCH resource corresponding to the to-be-reported CSI isthe first format is specifically:

if the quantity of bits is less than or equal to a third quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 2; or

if the quantity of bits is greater than the third quantity and is lessthan or equal to a fourth quantity, determining that the format of thePUCCH resource corresponding to the to-be-reported CSI is the PUCCHformat 3; or

if the quantity of bits is greater than the fourth quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4.

Optionally, in this embodiment of the present invention, the sendingmodule 303 is specifically configured to:

determine the first PUCCH resource from at least one first-format PUCCHresource corresponding to each of the one or more downlink carriergroups to which the to-be-reported CSI belongs; and

add the to-be-reported CSI to the first PUCCH resource, and report theto-be-reported CSI.

Optionally, in this embodiment of the present invention, that thesending module 303 is specifically configured to determine the firstPUCCH resource from at least one first-format PUCCH resourcecorresponding to each of the one or more downlink carrier groups towhich the to-be-reported CSI belongs is specifically:

determining the first PUCCH resource from the at least one PUCCHresource according to received information sent by a network device; or

determining, from the at least one PUCCH resource, a smallest-numberedPUCCH resource as the first PUCCH resource; or

determining, from the at least one PUCCH resource, a largest-numberedPUCCH resource as the first PUCCH resource; or

determining, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a smallest-numberedcarrier as the first PUCCH resource; or

determining, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a largest-numberedcarrier as the first PUCCH resource.

Referring to FIG. 4, based on a same inventive concept, an embodiment ofthe present invention provides a network device. The network device maybe, for example, a base station. The network device may include a firstdetermining module 401, a second determining module 402, and a receivingmodule 403.

The first determining module 401 is configured to determine CSI that isto be reported by user equipment in an uplink subframe. The CSI iscorresponding to one or more downlink carrier groups. At least two PUCCHresources are configured for one downlink carrier group. The at leasttwo PUCCH resources have different formats.

The second determining module 402 is configured to determine, accordingto the CSI, that a format of a PUCCH resource corresponding to the CSIis a first format.

The receiving module 403 is configured to receive the CSI carried on afirst first-format PUCCH resource.

Optionally, in this embodiment of the present invention,

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format3; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 3 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2, a PUCCH resource corresponding to a PUCCH format 3,and a PUCCH resource corresponding to a PUCCH format 4.

Optionally, in this embodiment of the present invention, the seconddetermining module 402 is specifically configured to:

determine, according to a quantity of carriers corresponding to the CSI,that the format of the PUCCH resource corresponding to the CSI is thefirst format; or

determine, according to a quantity of bits of the CSI, that the formatof the PUCCH resource corresponding to the CSI is the first format.

Optionally, in this embodiment of the present invention, the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 2 and the PUCCH resource corresponding to the PUCCH format3; and

that the second determining module 402 is specifically configured todetermine, according to a quantity of carriers corresponding to the CSI,that the format of the PUCCH resource corresponding to the CSI is thefirst format is specifically:

if the quantity of carriers is greater than a first quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 3; otherwise, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 2; or

that the second determining module 402 is specifically configured todetermine, according to a quantity of bits of the CSI, that the formatof the PUCCH resource corresponding to the CSI is the first format isspecifically:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 3; otherwise, determining that the format of the PUCCHresource corresponding to the CSI is the PUCCH format 2.

Optionally, in this embodiment of the present invention, the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 2 and the PUCCH resource corresponding to the PUCCH format4; and

that the second determining module 402 is specifically configured todetermine, according to a quantity of carriers corresponding to the CSI,that the format of the PUCCH resource corresponding to the CSI is thefirst format is specifically:

if the quantity of carriers is greater than a first quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 4; otherwise, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 2; or

that the second determining module 402 is specifically configured todetermine, according to a quantity of bits of the CSI, that the formatof the PUCCH resource corresponding to the CSI is the first format isspecifically:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 4; otherwise, determining that the format of the PUCCHresource corresponding to the CSI is the PUCCH format 2.

Optionally, in this embodiment of the present invention, the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 3 and the PUCCH resource corresponding to the PUCCH format4; and

that the second determining module 402 is specifically configured todetermine, according to a quantity of carriers corresponding to the CSI,that the format of the PUCCH resource corresponding to the CSI is thefirst format is specifically:

if the quantity of carriers is greater than a second quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 4; otherwise, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 3; or

that the second determining module 402 is specifically configured todetermine, according to a quantity of bits of the CSI, that the formatof the PUCCH resource corresponding to the CSI is the first format isspecifically:

if the quantity of bits is greater than a fourth quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 4; otherwise, determining that the format of the PUCCHresource corresponding to the CSI is the PUCCH format 3.

Optionally, in this embodiment of the present invention, the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 2, the PUCCH resource corresponding to the PUCCH format 3,and the PUCCH resource corresponding to the PUCCH format 4; and

that the second determining module 402 is specifically configured todetermine, according to a quantity of carriers corresponding to the CSI,that the format of the PUCCH resource corresponding to the CSI is thefirst format is specifically:

if the quantity of carriers is less than or equal to a first quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 2; or

if the quantity of carriers is greater than the first quantity and isless than or equal to a second quantity, determining that the format ofthe PUCCH resource corresponding to the CSI is the PUCCH format 3; or

if the quantity of carriers is greater than the second quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 4; or

that the second determining module 402 is specifically configured todetermine, according to a quantity of bits of the CSI, that the formatof the PUCCH resource corresponding to the CSI is the first format isspecifically:

if the quantity of bits is less than or equal to a third quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 2; or

if the quantity of bits is greater than the third quantity and is lessthan or equal to a fourth quantity, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 3; or

if the quantity of bits is greater than the fourth quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 4.

Optionally, in this embodiment of the present invention, the networkdevice further includes a third determining module and a fourthdetermining module.

The third determining module is configured to: before the receivingmodule 403 receives the CSI carried on a first first-format PUCCHresource, determine the first PUCCH resource from at least onefirst-format PUCCH resource corresponding to each of the one or moredownlink carrier groups to which the CSI belongs.

The fourth determining module is configured to determine to receive theCSI by using the first PUCCH resource.

Optionally, in this embodiment of the present invention, the thirddetermining module is specifically configured to:

determine the first PUCCH resource from the at least one PUCCH resourceaccording to received information sent by the network device; or

determine, from the at least one PUCCH resource, a smallest-numberedPUCCH resource as the first PUCCH resource; or

determine, from the at least one PUCCH resource, a largest-numberedPUCCH resource as the first PUCCH resource; or

determine, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a smallest-numberedcarrier as the first PUCCH resource; or

determine, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a largest-numberedcarrier as the first PUCCH resource.

Referring to FIG. 5, based on a same inventive concept, an embodiment ofthe present invention provides user equipment. The user equipment mayinclude a memory 501, a processor 502, and a transceiver 503 that areconnected to a bus 500.

The memory 501 is configured to store an instruction required by theprocessor 502 for executing a task.

The processor 502 is configured to: execute the instruction stored bythe memory 501, to obtain channel state information CSI that is to bereported in an uplink subframe, where the to-be-reported CSI iscorresponding to one or more downlink carrier groups, at least twophysical uplink control channel PUCCH resources are configured for onedownlink carrier group, and the at least two PUCCH resources havedifferent formats; determine, according to the to-be-reported CSI, thata format of a PUCCH resource corresponding to the to-be-reported CSI isa first format; and add the to-be-reported CSI to a first first-formatPUCCH resource, and report the to-be-reported CSI by using thetransceiver 503.

Optionally, in this embodiment of the present invention,

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format3; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 3 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2, a PUCCH resource corresponding to a PUCCH format 3,and a PUCCH resource corresponding to a PUCCH format 4.

Optionally, in this embodiment of the present invention, that theprocessor 502 is configured to determine, according to theto-be-reported CSI, that a format of a PUCCH resource corresponding tothe to-be-reported CSI is a first format is specifically:

determining, according to a quantity of carriers corresponding to theto-be-reported CSI, that the format of the PUCCH resource correspondingto the to-be-reported CSI is the first format; or

determining, according to a quantity of bits of the to-be-reported CSI,that the format of the PUCCH resource corresponding to theto-be-reported CSI is the first format.

Optionally, in this embodiment of the present invention, the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 2 and the PUCCH resource corresponding to the PUCCH format3; and

that the processor 502 is specifically configured to determine,according to a quantity of carriers corresponding to the to-be-reportedCSI, that the format of the PUCCH resource corresponding to theto-be-reported CSI is the first format is specifically:

if the quantity of carriers is greater than a first quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 3; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 2; or

that the processor 502 is specifically configured to determine,according to a quantity of bits of the to-be-reported CSI, that theformat of the PUCCH resource corresponding to the to-be-reported CSI isthe first format is specifically:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 3; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 2.

Optionally, in this embodiment of the present invention, the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 2 and the PUCCH resource corresponding to the PUCCH format4; and

that the processor 502 is specifically configured to determine,according to a quantity of carriers corresponding to the to-be-reportedCSI, that the format of the PUCCH resource corresponding to theto-be-reported CSI is the first format is specifically:

if the quantity of carriers is greater than a first quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 2; or

that the processor 502 is specifically configured to determine,according to a quantity of bits of the to-be-reported CSI, that theformat of the PUCCH resource corresponding to the to-be-reported CSI isthe first format is specifically:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 2.

Optionally, in this embodiment of the present invention, the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 3 and the PUCCH resource corresponding to the PUCCH format4; and

that the processor 502 is specifically configured to determine,according to a quantity of carriers corresponding to the to-be-reportedCSI, that the format of the PUCCH resource corresponding to theto-be-reported CSI is the first format is specifically:

if the quantity of carriers is greater than a second quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; otherwise, determining thatthe format of the PUCCH resource corresponding to the to-be-reported CSIis the PUCCH format 3; or

that the processor 502 is specifically configured to determine,according to a quantity of bits of the to-be-reported CSI, that theformat of the PUCCH resource corresponding to the to-be-reported CSI isthe first format is specifically:

if the quantity of bits is greater than a fourth quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4;

otherwise, determining that the format of the PUCCH resourcecorresponding to the to-be-reported CSI is the PUCCH format 3.

Optionally, in this embodiment of the present invention, the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 2, the PUCCH resource corresponding to the PUCCH format 3,and the PUCCH resource corresponding to the PUCCH format 4; and

that the processor 502 is specifically configured to determine,according to a quantity of carriers corresponding to the to-be-reportedCSI, that the format of the PUCCH resource corresponding to theto-be-reported CSI is the first format is specifically:

if the quantity of carriers is less than or equal to a first quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 2; or

if the quantity of carriers is greater than the first quantity and isless than or equal to a second quantity, determining that the format ofthe PUCCH resource corresponding to the to-be-reported CSI is the PUCCHformat 3; or

if the quantity of carriers is greater than the second quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4; or

that the processor 502 is specifically configured to determine,according to a quantity of bits of the to-be-reported CSI, that theformat of the PUCCH resource corresponding to the to-be-reported CSI isthe first format is specifically:

if the quantity of bits is less than or equal to a third quantity,determining that the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 2; or

if the quantity of bits is greater than the third quantity and is lessthan or equal to a fourth quantity, determining that the format of thePUCCH resource corresponding to the to-be-reported CSI is the PUCCHformat 3; or

if the quantity of bits is greater than the fourth quantity, determiningthat the format of the PUCCH resource corresponding to theto-be-reported CSI is the PUCCH format 4.

Optionally, in this embodiment of the present invention, that theprocessor 502 is configured to add the to-be-reported CSI to a firstfirst-format PUCCH resource, and report the to-be-reported CSI by usingthe transceiver 503 is specifically:

determining the first PUCCH resource from at least one first-formatPUCCH resource corresponding to each of the one or more downlink carriergroups to which the to-be-reported CSI belongs; and

adding the to-be-reported CSI to the first PUCCH resource, and reportingthe to-be-reported CSI by using the transceiver.

Optionally, in this embodiment of the present invention, that theprocessor 502 is specifically configured to determine the first PUCCHresource from at least one first-format PUCCH resource corresponding toeach of the one or more downlink carrier groups to which theto-be-reported CSI belongs is specifically:

determining the first PUCCH resource from the at least one PUCCHresource according to information that is sent by a network device andthat is received by the transceiver 503; or

determining, from the at least one PUCCH resource, a smallest-numberedPUCCH resource as the first PUCCH resource; or

determining, from the at least one PUCCH resource, a largest-numberedPUCCH resource as the first PUCCH resource; or

determining, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a smallest-numberedcarrier as the first PUCCH resource; or

determining, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a largest-numberedcarrier as the first PUCCH resource.

Referring to FIG. 6, based on a same inventive concept, an embodiment ofthe present invention provides a network device. The network device maybe a base station. The network device may include a memory 601, aprocessor 602, and a receiver 603 that are connected to a bus 600.

The memory 601 is configured to store an instruction required by theprocessor 602 for executing a task.

The processor 602 is configured to: execute the instruction, todetermine CSI that is to be reported by user equipment in an uplinksubframe, where the CSI is corresponding to one or more downlink carriergroups, at least two PUCCH resources are configured for one downlinkcarrier group, and the at least two PUCCH resources have differentformats; and determine, according to the CSI, that a format of a PUCCHresource corresponding to the CSI is a first format.

The receiver 603 is configured to receive the CSI carried on a firstfirst-format PUCCH resource.

Optionally, in this embodiment of the present invention,

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format3; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 3 and a PUCCH resource corresponding to a PUCCH format4; or

the at least two PUCCH resources include a PUCCH resource correspondingto a PUCCH format 2, a PUCCH resource corresponding to a PUCCH format 3,and a PUCCH resource corresponding to a PUCCH format 4.

Optionally, in this embodiment of the present invention, that theprocessor 602 is configured to determine, according to the CSI, that aformat of a PUCCH resource corresponding to the CSI is a first format isspecifically:

determining, according to a quantity of carriers corresponding to theCSI, that the format of the PUCCH resource corresponding to the CSI isthe first format; or

determining, according to a quantity of bits of the CSI, that the formatof the PUCCH resource corresponding to the CSI is the first format.

Optionally, in this embodiment of the present invention, the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 2 and the PUCCH resource corresponding to the PUCCH format3; and

that the processor 602 is specifically configured to determine,according to a quantity of carriers corresponding to the CSI, that theformat of the PUCCH resource corresponding to the CSI is the firstformat is specifically:

if the quantity of carriers is greater than a first quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 3; otherwise, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 2; or

that the processor 602 is specifically configured to determine,according to a quantity of bits of the CSI, that the format of the PUCCHresource corresponding to the CSI is the first format is specifically:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 3; otherwise, determining that the format of the PUCCHresource corresponding to the CSI is the PUCCH format 2.

Optionally, in this embodiment of the present invention, the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 2 and the PUCCH resource corresponding to the PUCCH format4; and

that the processor 602 is specifically configured to determine,according to a quantity of carriers corresponding to the CSI, that theformat of the PUCCH resource corresponding to the CSI is the firstformat is specifically:

if the quantity of carriers is greater than a first quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 4; otherwise, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 2; or

that the processor 602 is specifically configured to determine,according to a quantity of bits of the CSI, that the format of the PUCCHresource corresponding to the CSI is the first format is specifically:

if the quantity of bits is greater than a third quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 4; otherwise, determining that the format of the PUCCHresource corresponding to the CSI is the PUCCH format 2.

Optionally, in this embodiment of the present invention, the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 3 and the PUCCH resource corresponding to the PUCCH format4; and

that the processor 602 is specifically configured to determine,according to a quantity of carriers corresponding to the CSI, that theformat of the PUCCH resource corresponding to the CSI is the firstformat is specifically:

if the quantity of carriers is greater than a second quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 4; otherwise, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 3; or

that the processor 602 is specifically configured to determine,according to a quantity of bits of the CSI, that the format of the PUCCHresource corresponding to the CSI is the first format is specifically:

if the quantity of bits is greater than a fourth quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 4; otherwise, determining that the format of the PUCCHresource corresponding to the CSI is the PUCCH format 3.

Optionally, in this embodiment of the present invention, the at leasttwo PUCCH resources include the PUCCH resource corresponding to thePUCCH format 2, the PUCCH resource corresponding to the PUCCH format 3,and the PUCCH resource corresponding to the PUCCH format 4; and

that the processor 602 is specifically configured to determine,according to a quantity of carriers corresponding to the CSI, that theformat of the PUCCH resource corresponding to the CSI is the firstformat is specifically:

if the quantity of carriers is less than or equal to a first quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 2; or

if the quantity of carriers is greater than the first quantity and isless than or equal to a second quantity, determining that the format ofthe PUCCH resource corresponding to the CSI is the PUCCH format 3; or

if the quantity of carriers is greater than the second quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 4; or

that the processor 602 is specifically configured to determine,according to a quantity of bits of the CSI, that the format of the PUCCHresource corresponding to the CSI is the first format is specifically:

if the quantity of bits is less than or equal to a third quantity,determining that the format of the PUCCH resource corresponding to theCSI is the PUCCH format 2; or

if the quantity of bits is greater than the third quantity and is lessthan or equal to a fourth quantity, determining that the format of thePUCCH resource corresponding to the CSI is the PUCCH format 3; or

if the quantity of bits is greater than the fourth quantity, determiningthat the format of the PUCCH resource corresponding to the CSI is thePUCCH format 4.

Optionally, in this embodiment of the present invention, the processor602 is further configured to:

before the receiver 603 receives the CSI carried on a first first-formatPUCCH resource, determine the first PUCCH resource from at least onefirst-format PUCCH resource corresponding to each of the one or moredownlink carrier groups to which the CSI belongs; and

determine to receive the CSI by using the first PUCCH resource.

Optionally, in this embodiment of the present invention, that theprocessor 602 is specifically configured to determine the first PUCCHresource from at least one first-format PUCCH resource corresponding toeach of the one or more downlink carrier groups to which theto-be-reported CSI belongs is specifically:

determining the first PUCCH resource from the at least one PUCCHresource according to received information sent by the network device;or

determining, from the at least one PUCCH resource, a smallest-numberedPUCCH resource as the first PUCCH resource; or

determine, from the at least one PUCCH resource, a largest-numberedPUCCH resource as the first PUCCH resource; or

determining, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a smallest-numberedcarrier as the first PUCCH resource; or

determining, from at least one carrier corresponding to the at least onePUCCH resource, a PUCCH resource corresponding to a largest-numberedcarrier as the first PUCCH resource.

In this embodiment of the present invention, at least two PUCCHresources are configured for each downlink carrier group. CSI that needsto be reported in one uplink subframe may be obtained, and a format of acorresponding PUCCH resource is determined according to theto-be-reported CSI. For example, the determined format is referred to asa first format. Then, all of the to-be-reported CSI is reported afterbeing added to a first first-format PUCCH resource. Therefore, in thisembodiment of the present invention, the CSI that needs to be reportedin one uplink subframe may be reported by occupying only one PUCCHresource. This greatly reduces PUCCH resource overheads and improves athroughput of an uplink system compared with a prior-art solution thateach CSI needs to occupy one PUCCH resource.

Moreover, in the prior art, if CSI of different carriers needs to bereported in one uplink subframe, only one piece of CSI can be selectedfor reporting, and other non-selected CSI is discarded. That is, CSIcorresponding to some carriers cannot be reported, and a base stationcannot perform effective downlink data scheduling for a downlink carriercorresponding to the unreported CSI. This causes performancedeterioration of a downlink system. However, after the technicalsolution in this embodiment of the present invention is used, CSI thatneeds to be reported in one uplink subframe can be reported after beingadded to a same PUCCH resource. This avoids, as far as possible,discarding CSI, and ensures that CSI of all downlink carriers that needsto be reported can be reported, so that a base station can relativelyeffectively schedule the downlink carriers, thereby improvingperformance of the downlink system.

It may be clearly understood by a person skilled in the art that, forthe purpose of convenient and brief description, division of theforegoing function modules is taken as an example for illustration. Inactual application, the foregoing functions can be allocated todifferent function modules and implemented according to a requirement.That is, an inner structure of an apparatus is divided into differentfunction modules to implement all or some of the functions describedabove. For a detailed working process of the foregoing system,apparatus, and unit, refer to a corresponding process in the foregoingmethod embodiments, and details are not further described herein.

In the several embodiments provided in this application, it should beunderstood that the disclosed system, apparatus, and method may beimplemented in other manners. For example, the described apparatusembodiment is merely an example. For example, the module or unitdivision is merely logical function division and may be other divisionin actual implementation. For example, a plurality of units orcomponents may be combined or integrated into another system, and somefeatures may be ignored or not performed. In addition, the displayed ordiscussed mutual couplings or direct couplings or communicationconnections may be indirect couplings or communication connectionsbetween some interfaces, apparatuses, or units, and may be implementedin electronic, mechanical, or other forms.

The units described as separate parts may or may not be physicallyseparate. Parts displayed as units may or may not be physical units, andmay be located in one position or may be distributed on a plurality ofnetwork units. Some or all of the units may be selected according toactual needs to achieve the objectives of the solutions of theembodiments.

In addition, functional units in the embodiments of this application maybe integrated into one processing unit, or each of the units may existalone physically, or two or more units are integrated into one unit. Theintegrated unit may be implemented in a form of hardware, or may beimplemented in a form of a software functional unit.

When the integrated unit is implemented in the form of a softwarefunctional unit and sold or used as an independent product, theintegrated unit may be stored in a computer-readable storage medium.Based on such an understanding, the technical solutions of the presentapplication essentially, or the part contributing to the prior art, orall or a part of the technical solutions may be implemented in the formof a software product. The software product is stored in a storagemedium and includes several instructions for instructing a computerdevice (which may be a personal computer, a server, a network device, orthe like) or a processor (processor) to perform all or a part of thesteps of the methods described in the embodiments of this application.The foregoing storage medium includes: any medium that can store programcode, such as a USB flash drive, a removable hard disk, a read-onlymemory (ROM), a random access memory (RAM), a magnetic disk, or anoptical disc.

The foregoing embodiments are merely used to describe the technicalsolutions of the present application. The foregoing embodiments aremerely intended to help understand the method and core idea of thepresent invention, and shall not be construed as a limitation on thepresent invention. Any variation or replacement readily figured out by aperson skilled in the art within the technical scope disclosed in thepresent invention shall fall within the protection scope of the presentinvention.

What is claimed is:
 1. A channel state information CSI reporting method,comprising: obtaining CSI that is to be reported in an uplink subframe,wherein the to-be-reported CSI is corresponding to one or more downlinkcarrier groups, at least two physical uplink control channel PUCCHresources are configured for one downlink carrier group, and the atleast two PUCCH resources have different formats; determining, accordingto the to-be-reported CSI, that a format of a PUCCH resourcecorresponding to the to-be-reported CSI is a first format; and addingthe to-be-reported CSI to a first first-format PUCCH resource, andreporting the to-be-reported CSI.
 2. The method according to claim 1,wherein the at least two PUCCH resources comprise a PUCCH resourcecorresponding to a PUCCH format 2 and a PUCCH resource corresponding toa PUCCH format 3; or the at least two PUCCH resources comprise a PUCCHresource corresponding to a PUCCH format 2 and a PUCCH resourcecorresponding to a PUCCH format 4; or the at least two PUCCH resourcescomprise a PUCCH resource corresponding to a PUCCH format 3 and a PUCCHresource corresponding to a PUCCH format 4; or the at least two PUCCHresources comprise a PUCCH resource corresponding to a PUCCH format 2, aPUCCH resource corresponding to a PUCCH format 3, and a PUCCH resourcecorresponding to a PUCCH format
 4. 3. The method according to claim 2,wherein the determining, according to the to-be-reported CSI, that aformat of a PUCCH resource corresponding to the to-be-reported CSI is afirst format comprises: determining, according to a quantity of carrierscorresponding to the to-be-reported CSI, that the format of the PUCCHresource corresponding to the to-be-reported CSI is the first format; ordetermining, according to a quantity of bits of the to-be-reported CSI,that the format of the PUCCH resource corresponding to theto-be-reported CSI is the first format.
 4. The method according to claim1, wherein the adding the to-be-reported CSI to a first first-formatPUCCH resource, and reporting the to-be-reported CSI comprises:determining the first PUCCH resource from at least one first-formatPUCCH resource corresponding to each of the one or more downlink carriergroups to which the to-be-reported CSI belongs; and adding theto-be-reported CSI to the first PUCCH resource, and reporting theto-be-reported CSI.
 5. The method according to claim 4, wherein thedetermining the first PUCCH resource from at least one first-formatPUCCH resource corresponding to each of the one or more downlink carriergroups to which the to-be-reported CSI belongs comprises: determiningthe first PUCCH resource from the at least one PUCCH resource accordingto received information sent by a network device; or determining, fromthe at least one PUCCH resource, a smallest-numbered PUCCH resource asthe first PUCCH resource; or determining, from the at least one PUCCHresource, a largest-numbered PUCCH resource as the first PUCCH resource;or determining, from at least one carrier corresponding to the at leastone PUCCH resource, a PUCCH resource corresponding to asmallest-numbered carrier as the first PUCCH resource; or determining,from at least one carrier corresponding to the at least one PUCCHresource, a PUCCH resource corresponding to a largest-numbered carrieras the first PUCCH resource.
 6. A channel state information CSIreceiving method, comprising: determining CSI that is to be reported byuser equipment in an uplink subframe, wherein the CSI is correspondingto one or more downlink carrier groups, at least two physical uplinkcontrol channel PUCCH resources are configured for one downlink carriergroup, and the at least two PUCCH resources have different formats;determining, according to the CSI, that a format of the PUCCH resourcecorresponding to the CSI is a first format; and receiving the CSIcarried on a first first-format PUCCH resource.
 7. The method accordingto claim 6, wherein the at least two PUCCH resources comprise a PUCCHresource corresponding to a PUCCH format 2 and a PUCCH resourcecorresponding to a PUCCH format 3; or the at least two PUCCH resourcescomprise a PUCCH resource corresponding to a PUCCH format 2 and a PUCCHresource corresponding to a PUCCH format 4; or the at least two PUCCHresources comprise a PUCCH resource corresponding to a PUCCH format 3and a PUCCH resource corresponding to a PUCCH format 4; or the at leasttwo PUCCH resources comprise a PUCCH resource corresponding to a PUCCHformat 2, a PUCCH resource corresponding to a PUCCH format 3, and aPUCCH resource corresponding to a PUCCH format
 4. 8. The methodaccording to claim 7, wherein the determining, according to the CSI,that a format of a PUCCH resource corresponding to the CSI is a firstformat comprises: determining, according to a quantity of carrierscorresponding to the CSI, that the format of the PUCCH resourcecorresponding to the CSI is the first format; or determining, accordingto a quantity of bits of the CSI, that the format of the PUCCH resourcecorresponding to the CSI is the first format.
 9. The method according toclaim 6, before the receiving the CSI carried on a first first-formatPUCCH resource, further comprising: determining the first PUCCH resourcefrom at least one first-format PUCCH resource corresponding to each ofthe one or more downlink carrier groups to which the CSI belongs; anddetermining to receive the CSI by using the first PUCCH resource. 10.The method according to claim 9, wherein the determining the first PUCCHresource from at least one first-format PUCCH resource corresponding toeach of the one or more downlink carrier groups to which the CSI belongscomprises: determining the first PUCCH resource from the at least onePUCCH resource according to received information sent by a networkdevice; or determining, from the at least one PUCCH resource, asmallest-numbered PUCCH resource as the first PUCCH resource; ordetermining, from the at least one PUCCH resource, a largest-numberedPUCCH resource as the first PUCCH resource; or determining, from atleast one carrier corresponding to the at least one PUCCH resource, aPUCCH resource corresponding to a smallest-numbered carrier as the firstPUCCH resource; or determining, from at least one carrier correspondingto the at least one PUCCH resource, a PUCCH resource corresponding to alargest-numbered carrier as the first PUCCH resource.
 11. Userequipment, comprising: an obtaining module, configured to obtain channelstate information CSI that is to be reported in an uplink subframe,wherein the to-be-reported CSI is corresponding to one or more downlinkcarrier groups, at least two physical uplink control channel PUCCHresources are configured for one downlink carrier group, and the atleast two PUCCH resources have different formats; a determining module,configured to determine, according to the to-be-reported CSI, that aformat of a PUCCH resource corresponding to the to-be-reported CSI is afirst format; and a sending module, configured to add the to-be-reportedCSI to a first first-format PUCCH resource, and report theto-be-reported CSI.
 12. The user equipment according to claim 11,wherein the at least two PUCCH resources comprise a PUCCH resourcecorresponding to a PUCCH format 2 and a PUCCH resource corresponding toa PUCCH format 3; or the at least two PUCCH resources comprise a PUCCHresource corresponding to a PUCCH format 2 and a PUCCH resourcecorresponding to a PUCCH format 4; or the at least two PUCCH resourcescomprise a PUCCH resource corresponding to a PUCCH format 3 and a PUCCHresource corresponding to a PUCCH format 4; or the at least two PUCCHresources comprise a PUCCH resource corresponding to a PUCCH format 2, aPUCCH resource corresponding to a PUCCH format 3, and a PUCCH resourcecorresponding to a PUCCH format
 4. 13. The user equipment according toclaim 12, wherein the determining module is specifically configured to:determine, according to a quantity of carriers corresponding to theto-be-reported CSI, that the format of the PUCCH resource correspondingto the to-be-reported CSI is the first format; or determine, accordingto a quantity of bits of the to-be-reported CSI, that the format of thePUCCH resource corresponding to the to-be-reported CSI is the firstformat.
 14. The user equipment according to claim 11, wherein thesending module is specifically configured to: determine the first PUCCHresource from at least one first-format PUCCH resource corresponding toeach of the one or more downlink carrier groups to which theto-be-reported CSI belongs; and add the to-be-reported CSI to the firstPUCCH resource, and report the to-be-reported CSI.
 15. The userequipment according to claim 14, wherein that the sending module isspecifically configured to determine the first PUCCH resource from atleast one first-format PUCCH resource corresponding to each of the oneor more downlink carrier groups to which the to-be-reported CSI belongsis specifically: determining the first PUCCH resource from the at leastone PUCCH resource according to received information sent by a networkdevice; or determining, from the at least one PUCCH resource, asmallest-numbered PUCCH resource as the first PUCCH resource; ordetermining, from the at least one PUCCH resource, a largest-numberedPUCCH resource as the first PUCCH resource; or determining, from atleast one carrier corresponding to the at least one PUCCH resource, aPUCCH resource corresponding to a smallest-numbered carrier as the firstPUCCH resource; or determining, from at least one carrier correspondingto the at least one PUCCH resource, a PUCCH resource corresponding to alargest-numbered carrier as the first PUCCH resource.
 16. A networkdevice, comprising: a first determining module, configured to determinechannel state information CSI that is to be reported by user equipmentin an uplink subframe, wherein the CSI is corresponding to one or moredownlink carrier groups, at least two physical uplink control channelPUCCH resources are configured for one downlink carrier group, and theat least two PUCCH resources have different formats; a seconddetermining module, configured to determine, according to the CSI, thata format of a PUCCH resource corresponding to the CSI is a first format;and a receiving module, configured to receive the CSI carried on a firstfirst-format PUCCH resource.
 17. The network device according to claim16, wherein the at least two PUCCH resources comprise a PUCCH resourcecorresponding to a PUCCH format 2 and a PUCCH resource corresponding toa PUCCH format 3; or the at least two PUCCH resources comprise a PUCCHresource corresponding to a PUCCH format 2 and a PUCCH resourcecorresponding to a PUCCH format 4; or the at least two PUCCH resourcescomprise a PUCCH resource corresponding to a PUCCH format 3 and a PUCCHresource corresponding to a PUCCH format 4; or the at least two PUCCHresources comprise a PUCCH resource corresponding to a PUCCH format 2, aPUCCH resource corresponding to a PUCCH format 3, and a PUCCH resourcecorresponding to a PUCCH format
 4. 18. The network device according toclaim 17, wherein the second determining module is specificallyconfigured to: determine, according to a quantity of carrierscorresponding to the CSI, that the format of the PUCCH resourcecorresponding to the CSI is the first format; or determine, according toa quantity of bits of the CSI, that the format of the PUCCH resourcecorresponding to the CSI is the first format.
 19. The network deviceaccording to claim 16, wherein the network device further comprises athird determining module and a fourth determining module, wherein thethird determining module is configured to: before the receiving modulereceives the CSI carried on a first first-format PUCCH resource,determine the first PUCCH resource from at least one first-format PUCCHresource corresponding to each of the one or more downlink carriergroups to which the CSI belongs; and the fourth determining module isconfigured to determine to receive the CSI by using the first PUCCHresource.
 20. The network device according to claim 19, wherein thethird determining module is specifically configured to: determine thefirst PUCCH resource from the at least one PUCCH resource according toreceived information sent by the network device; or determine, from theat least one PUCCH resource, a smallest-numbered PUCCH resource as thefirst PUCCH resource; or determine, from the at least one PUCCHresource, a largest-numbered PUCCH resource as the first PUCCH resource;or determine, from at least one carrier corresponding to the at leastone PUCCH resource, a PUCCH resource corresponding to asmallest-numbered carrier as the first PUCCH resource; or determine,from at least one carrier corresponding to the at least one PUCCHresource, a PUCCH resource corresponding to a largest-numbered carrieras the first PUCCH resource.